Problem with square brackets in fSolve

09082023, 08:56 AM
Post: #1




Problem with square brackets in fSolve
I wanted to solve a system of 2 equations with X and Y as unknowns. Whenever I opened the square brackets a +/ sign was included that could not be removed. So it looked different to the examples in the manual.
So I went to CAS menue (not in CAS mode) and Numerical Solve so there was CAS.fsolve() on the screen. Then I pressed Help. There were two examples. The second example was fsolve([x²+y2,x+y²2],[x,y],[0,0]) I pressed Example and highlighted the second example. When I copied it I got: CAS.fsolve([x²+y2 x+y²2 +/],[x y +/],[0 0 +/]) Pressing Enter gives message: Error: Syntax Error It seems that the elements in the square brackets are interpreted as elements of a matrix. How can I use the fSove function for more than one equation? Thank you very much for your help! 

09082023, 11:29 AM
Post: #2




RE: Problem with square brackets in fSolve  
09082023, 04:17 PM
Post: #3




RE: Problem with square brackets in fSolve
Hi Didier,
thank you very much for your fast and helpful answer. In CAS mode it works fine. I tried in home mode and there I got again the message "Error: Syntax Error". In CAS mode the +/ before the closing of the square bracket that is generated as soon a square bracket is opened disappear when pressing Enter. In home mode it does not disappear. And I think it strange that this is a problem to be solved in CAS mode as it is a strictly numeric problem. But I am glad that I now know how to do it. Thank you once more! 

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