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Convert String to Function

Posted on 2008-03-31 23:37 By jflanigan (Maple Rating 1 12)
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As many of you have experienced, the maplet MathMLEditor, has some problem when it comes to interpret correctly the typing functions, even some functions with the help of the palette.

I was trying to input this function : sin(4*x)+cos(2*x) but after moving form the unknown tag _XML_ error, I end up with misinterpretations of this function, to things like  4*sin(x)+cos(2*x).

So, the comments in this blog tells that the better solution is to use a TextField to get the input function, but now I face this problem

f := Get('txtFunction');
 

makes f an string with the value "sin(4*x)+cos(2*x)" so I can manipulate it, like calculating the derivative, or evaluating it.

Anybody can tell me how can I do this?

Thanks

Comments

Use parse

Comment on 2008-04-01 00:14 from Joe Riel (Maple Rating 4 1258) 
str := "sin(4*x)+cos(2*x)";
                                      str := "sin(4*x)+cos(2*x)"

y := parse(str);
                                       y := sin(4 x) + cos(2 x)

diff(y,x);
                                        4 cos(4 x) - 2 sin(2 x)
 

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