dan hayes

not sure exactly what a terminal window means For some other cases I can do ctrl I and it works but i think that was with prior version of maxima. I think you were mistaken when you wrote ctrl c and meant ctrl i ? By the way this was not a duplicate of the last report. That one was a longer command and one could restart maxima from within the session. This is different as just an example of one cannot even restart maxima within the maxima interface as like keyboard is locked and does nothing . The...

actually you told me the cannot signal interrupt was a wxmaxima issue. was not sure if this issue was or was not.

NO way out : cannot interrupt nor restart maxima

Note lis was the list of the unknowns for which to be solved which was lis:[x[1],x[2],x[3],x[4]]

Could not send interrupt signal to maxima. error

putting above and below does not format it properly as multiplication signs are still not shown unless you meant specifically - unless your wrote ~~~~~ or something like that rather than just -----------------. As i finally figured only if i check the </> code tab above does it format properly and then only under further requirements. It is not resolved unless you say '....could not send interrupt...' signal error is ok. I would think not as it should have given parsing,syntax or do not use keywords...

suspecting it may have something to do with the key word do so i renamed it di[i] and sum(di[i]:coeff(dn,diff(f,r[i]))*diff(f,r[i])+coeff(dn,diff(f,r[i],2)) *diff(f,r[i],2),i,1,3) Did work so it should NOT have hung and instead given parsing or syntax error and NOT 'Could not send an interrupt signal to maxima." error when try to interrupt when it should not have been trying to calculate in the first place.

ok i try sum(do[i]:coeff(dn,diff(f,r[i]))*diff(f,r[i])+coeff(dn,diff(f,r[i],2))*diff(f,r[i],2),i,1,3),