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between -10 and 10 (inclusive):
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between -10 and 10 (inclusive):
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<pre>
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<pre>
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\integer{x1=random(-10..10)}
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\integer{x1=random(-10..10)}
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</pre>
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</pre>
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This random parameter may then be called by the word
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This random parameter may then be called by the word
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<b><tt>\x1</tt></b>, in the statement, the replis, the hint and the solution.
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<b><tt class="wims_code_variable">x1</tt></b>, in the statement, the replis, the hint and the solution.
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That is, each word <tt>\x1</tt> in these texts will be replaced
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That is, each word <tt class="wims_code_variable">x1</tt> in these texts will be replaced
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by the random value of the parameter. This substitution will also take
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by the random value of the parameter. This substitution will also take
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place in the definitions of other parameters which follow that of x1.
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place in the definitions of other parameters which follow that of x1.
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<p>
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<p>
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Suppose now that you have entered
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Suppose now that you have entered
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<pre>
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<pre>
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in the field of the definition of parameters, and the question
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in the field of the definition of parameters, and the question
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<pre>
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<pre>
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Compute the multiplication of \x1 by \y1.
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Compute the multiplication of \x1 by \y1.
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</pre>
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</pre>
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in the statement of the exercise. Suppose that for a certain request of
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in the statement of the exercise. Suppose that for a certain request of
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the exercise, a random value <font color=red>-7</font>
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the exercise, a random value <font color="red">-7</font>
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is attributed to \x1. Then the following parameter \y1 will take the value
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is attributed to \x1. Then the following parameter \y1 will take the value
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-4, and the statement of the exercise will be presented under the form<p>
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-4, and the statement of the exercise will be presented under the form<p>
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<center>Compute the multiplication of -7 by -4.
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<center>Compute the multiplication of -7 by -4.
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</center> <p>
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</center> <p>
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You may then define a numerical reply in the name of <tt>The product</tt>,
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You may then define a numerical reply in the name of <tt>The product</tt>,
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having for the good solution <tt>(\x1)*(\y1)</tt>. (Remark that here
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having for the good solution <tt class="wims_code_words">(\x1)*(\y1)</tt>. (Remark that here
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the parentheses are necessary, because the substitution is done literarily.)
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the parentheses are necessary, because the substitution is done literarily.)
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<a name=list></a>
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<a name="list"></a>
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!if oefparm isitemof $special_parm
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!if oefparm isitemof $special_parm
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 !changeto help/oefparm.phtml
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 !changeto help/oefparm.phtml
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!endif
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!endif
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<p>$table_header
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<p>$table_header
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<caption>Some other examples of parameters
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<caption>Some other examples of parameters
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!href cmd=help&special_parm=$special_parm,oefparm#list [complete list]
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!href cmd=help&special_parm=$special_parm,oefparm#list [complete list]
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</caption>
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</caption>
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$table_hdtr<th>Definition<th>Effect
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$table_hdtr<th>Definition<th>Effect
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$table_tr<td><tt>\real{x=random(-5..5)}</tt>
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$table_tr<td><tt class="wims_code_words">\real{x=random(-5..5)}</tt>
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    <td>\x will be a random real number<br>between -5 and 5
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    <td>\x will be a random real number<br>between -5 and 5
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$table_tr<td><tt>\real{a=random(-5,-3,0.3,4)}</tt>
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$table_tr<td><tt class="wims_code_words">\real{a=random(-5,-3,0.3,4)}</tt>
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    <td>\a will be a real number taken randomly<br>among -5,-3,0.3 and 4
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    <td>\a will be a real number taken randomly<br>among -5,-3,0.3 and 4
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$table_tr<td><tt>\complex{z=(1+2*i)^3}</tt>
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$table_tr<td><tt class="wims_code_words">\complex{z=(1+2*i)^3}</tt>
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    <td>\z will be the complex number (1+2*i)^3
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    <td>\z will be the complex number (1+2*i)^3
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$table_tr<td><tt>\text{sign=random(+,-)}</tt>
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$table_tr<td><tt class="wims_code_words">\text{sign=random(+,-)}</tt>
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    <td>\sign will be a random sign: + ou -
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    <td>\sign will be a random sign: + ou -
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$table_tr<td><tt>\integer{n=3*exp(\a)}</tt>
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$table_tr<td><tt class="wims_code_words">\integer{n=3*exp(\a)}</tt>
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    <td>\n will be the closest integer to 3*e<sup>\a</sup> <br>(it depends on
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    <td>\n will be the closest integer to 3*e<sup>\a</sup> <br>(it depends on
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    the value of \a)
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    the value of \a)
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$table_tr<td><tt>\function{f=random<br> (x^2+1,sin(x),log(x))}</tt>
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$table_tr<td><tt class="wims_code_words">\function{f=random<br> (x^2+1,sin(x),log(x))}</tt>
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    <td>\f will be a random function: either x^2+1,<br>or sin(x), or
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    <td>\f will be a random function: either x^2+1,<br>or sin(x), or
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    log(x)
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    log(x)
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$table_tr<td><tt>\real{a=evalue(x^2+sin(y),x=3,y=4)}</tt>
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$table_tr<td><tt class="wims_code_words">\real{a=evalue(x^2+sin(y),x=3,y=4)}</tt>
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    <td>Evaluation of the function x^2+sin(y),<br>
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    <td>Evaluation of the function x^2+sin(y),<br>
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    for x=3, y=4
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    for x=3, y=4
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$table_tr<td><tt>\real{r=solve(x^3-3*x+1,x=0..1)}</tt>
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$table_tr<td><tt class="wims_code_words">\real{r=solve(x^3-3*x+1,x=0..1)}</tt>
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    <td>\r will the the simple root of x^3-3x+1 between 0 and 1
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    <td>\r will the the simple root of x^3-3x+1 between 0 and 1
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$table_tr<td><tt>\function{h=simplify(x^5*y^3*x^2/y)}</tt>
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$table_tr<td><tt class="wims_code_words">\function{h=simplify(x^5*y^3*x^2/y)}</tt>
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    <td>Simplified expression: x<sup>7</sup>y<sup>2</sup>
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    <td>Simplified expression: x<sup>7</sup>y<sup>2</sup>
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$table_tr<td><tt>\function{g=diff(sin(x)+cos(y),x)}</tt>
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$table_tr<td><tt class="wims_code_words">\function{g=diff(sin(x)+cos(y),x)}</tt>
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    <td>\g will the the derivative of sin(x)+cos(y) with respect to x
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    <td>\g will the the derivative of sin(x)+cos(y) with respect to x
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$table_tr<td><tt>\function{F=int(x^2+3*x+1,x)}</tt>
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$table_tr<td><tt class="wims_code_words">\function{F=int(x^2+3*x+1,x)}</tt>
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    <td>\F will an antiderivative of x^2+3*x+1,<br>
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    <td>\F will an antiderivative of x^2+3*x+1,<br>
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     the constant term being not garanteed to be always the same
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     the constant term being not garanteed to be always the same
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!!$table_tr<td><tt>\function{F=int(t^2+3*t+1,t=1..x)}
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!!$table_tr<td><tt class="wims_code_words">\function{F=int(t^2+3*t+1,t=1..x)}
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!!    <td>\F will the antiderivative of x^2+3*x+1 with g(1)=0
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!!    <td>\F will the antiderivative of x^2+3*x+1 with g(1)=0
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$table_tr<td><tt>\real{a=int(t^2+3*t+1,t=0..1)}</tt>
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$table_tr<td><tt class="wims_code_words">\real{a=int(t^2+3*t+1,t=0..1)}</tt>
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    <td>\a will the numerical integral of x^2+3*x+1 from 0 to 1
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    <td>\a will the numerical integral of x^2+3*x+1 from 0 to 1
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$table_tr<td><tt>\text{f=htmlmath(2*x^2+3*x)}</tt>
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$table_tr<td><tt class="wims_code_words">\text{f=htmlmath(2*x^2+3*x)}</tt>
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    <td>\f will be rendered in html as: 2x<sup>2</sup>+3x
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    <td>\f will be rendered in html as: 2x<sup>2</sup>+3x
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$table_tr<td><tt>\text{f=texmath(2*x^2+3*x)}</tt>
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$table_tr<td><tt class="wims_code_words">\text{f=texmath(2*x^2+3*x)}</tt>
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    <td>\f will be the TeX source for the expression.
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    <td>\f will be the TeX source for the expression.
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$table_tr<td><tt>\integer{n=items(a,b,c,d,e,f)}</tt>
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$table_tr<td><tt class="wims_code_words">\integer{n=items(a,b,c,d,e,f)}</tt>
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    <td>\n will be the number of items (here it is 6) in the list
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    <td>\n will be the number of items (here it is 6) in the list
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     {a,b,c,d,e,f}
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     {a,b,c,d,e,f}
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$table_tr<td><tt>\text{i=item(3,a,b,c,d,e,f)}</tt>
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$table_tr<td><tt class="wims_code_words">\text{i=item(3,a,b,c,d,e,f)}</tt>
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    <td>\i will be the item number 3 of the list
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    <td>\i will be the item number 3 of the list
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     {a,b,c,d,e,f} (hence c).
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     {a,b,c,d,e,f} (hence c).
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$table_tr<td><tt>\text{s=shuffle(6)}</tt>
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$table_tr<td><tt class="wims_code_words">\text{s=shuffle(6)}</tt>
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    <td>\s will be the list of 6 integers 1,2,...,6, in random order.
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    <td>\s will be the list of 6 integers 1,2,...,6, in random order.
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$table_tr<td><tt>\text{s=shuffle(a,b,c,d,e)}</tt>
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$table_tr<td><tt class="wims_code_words">\text{s=shuffle(a,b,c,d,e)}</tt>
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    <td>\s will be the letters {a,b,c,d,e} in random order.
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    <td>\s will be the letters {a,b,c,d,e} in random order.
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$table_tr<td><tt>\matrix{m=1,2,3<br>4,5,6<br>7,8,9}</tt>
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$table_tr<td><tt class="wims_code_words">\matrix{m=1,2,3<br>4,5,6<br>7,8,9}</tt>
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    <td>\m will be the matrix of 3 rows and 3 columns.
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    <td>\m will be the matrix of 3 rows and 3 columns.
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$table_tr<td><tt>\text{t=asis(How do you do? item(1,2,3))}</tt>
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$table_tr<td><tt class="wims_code_words">\text{t=asis(How do you do? item(1,2,3))}</tt>
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    <td>The string as it is, with no transformation nor conditionality.
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    <td>The string as it is, with no transformation nor conditionality.
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$table_end <p>
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$table_end <p>
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Conditional parameters: You may write<p>
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Conditional parameters: You may write
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<pre>
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<tt>\text{ttt=_condition?_def1}</tt> or <br>
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\text{ttt=_condition?_def1}
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<tt>\text{ttt=_condition?_def1:_def2}</tt>
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\text{ttt=_condition?_def1:_def2}
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</pre>
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<p>
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<p>
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In this case, <tt>ttt</tt> will be set to <tt>_def1</tt> if
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In this case, <tt>ttt</tt> will be set to <tt>_def1</tt> if
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<tt>_condition</tt> is true, or to <tt>_def2</tt> otherwise (in the second
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<tt>_condition</tt> is true, or to <tt>_def2</tt> otherwise (in the second
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syntax).
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syntax).
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!href target=wims_mhelp cmd=help&special_parm=if List of conditions
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!href target=wims_mhelp cmd=help&special_parm=if List of conditions
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<p>
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<p>
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The relative positionning of the definition and the statement is important:
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The relative positionning of the definition and the statement is important:
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if a variable is defined AFTER the statement, the evaluation of the variable
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if a variable is defined AFTER the statement, the evaluation of the variable
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will take place only AFTER the user has replied to the question. In this
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will take place only AFTER the user has replied to the question. In this
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case, the definition may involve user replies, via <tt>\reply1</tt>,
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case, the definition may involve user replies, via <tt class="wims_code_variable">\reply1</tt>,
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<tt>\reply2</tt>, etc. And the variable can be used in testing
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<tt class="wims_code_variable">\reply2</tt>, etc. And the variable can be used in testing
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conditions or feedbacks.
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conditions or feedbacks.
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