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Can I have the user input a non linear equation?

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Amruth Chundi
Amruth Chundi 2016-8-16
评论： Amruth Chundi 2016-8-16
I have to take user's input( a non- linear equation, say f(x) ) and plot it against x and find the solutions using different numerical methods. I have tried inline , str2func, @(x) and nothing's working. For example, user should be able to give f(x) = exp(-x) - x = 0 or f(x) = 600x^4 -550x^3 +200x^2 -70 = 0 and the code should plot it and find its solutions ( the solutions' part is easier to handle but I am stuck at the plot thing)

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Torsten
Torsten 2016-8-16
  1 个评论
Amruth Chundi
Amruth Chundi 2016-8-16
I used this : str = input('Enter the Non-linear Fucntion : ', 's') ; f = str2func(['@(x)' str]);
And errors I got : Undefined function or variable 's'.
Error in Q1 (line 3) f = str2func(['@(x)' str]);

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