Other alternative than syms for differentiation and integration?

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Muhammad Fakhruddin Abd Rahim
评论： Star Strider 2019-11-18
Hello Everyone,
I'm trying to use differentiation in Matlab using this code
syms X;
fun = x^3+2*x+10;
diff (fun,x);
But I got this error
"Undefined function 'syms' for input arguments of type 'char'.
Error in Diff_Integ (line 1)
syms X;"
Is there any alternative ways to use differentiation without using syms?

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回答（2 个）

Star Strider
Star Strider 2019-11-15
MATLAB is case-sensitive, so X ~= x.
Try this:
syms x;
fun = x^3+2*x+10;
dfundx = diff (fun,x);
producing:
dfundx =
3*x^2 + 2
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Walter Roberson
Walter Roberson 2019-11-15
https://www.mathworks.com/help/matlab/ref/polyder.html for the special case of polynomials.

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