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!set methtit=Rewrite an integral
!set methenv=ZZ QQ RR
!set methparmtype=parm function integrate, function
!set methhelp=You can rewrite the kernel of an integral in an equivalent form.

!if $wims_read_parm iswordof form check
  !goto $wims_read_parm
!endif

!exit
:form
!reset methparm3
!set N=!linecnt $mtobj1
!if $N=1
  !set l=!item 2 to -1 of $mtobj1
  !set l=!mathsubst integrate= in $l
  !set l=!declosing $l
  !set v=!item 2 of $l
!endif
 Rewrite the integration
!read deduc/methparm.phtml 1
 in
<div class="wimscenter">
\(integrate())
!read deduc/methparm.phtml 2,40
!if $N=1
  d$v
!else
  d<input size="4" name="methparm3">
!endif
</div>
!exit
:check
ker=!item 2 of $methparmobj1
ker=!mathsubst integrate= in $ker
ker=!trim $ker
ker=!declosing $ker
!distribute items $ker into iker,ivar
vartest=!varlist $ivar
!if $ivar != $vartest
  error=Fail
  !exit
!endif

methparm3=!word 1 of $methparm3
!if $methparm3!=$empty and $methparm3!=$ivar
  error=You cannot change the variable name here. Please correct.
  !exit
!endif
!read deduc/sub/checkzero ($iker)-($methparm2)
!if $out=$empty
  error=bad_data
  !exit
!endif
!if $out!=yes
  error=Bad rewriting. Please correct.
  !exit
!endif

newobject1=integrate($methparm2,$ivar)
oldobject=1
methexp=rewriting
!exit