Symbolic Toolbox Integration Error

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Dan Lamone
Dan Lamone 2019-9-22
评论： Dan Lamone 2019-9-22
Trialing the symbolic toolbox and attempting to run the 'Indefinite Integral of Univariate Expression' example from the int function documentation. Copy and pasting the exact code and recieve the following:
syms x
expr = -2*x/(1+x^2)^2;
F = int(expr)
--------
Error using sym/subsindex (line 855)
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables, and function body must be sym expression.
-----------
Is this a settings error? Demo/trial error? The symbolic differentiation tool works just fine. Many thanks for your help!

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采纳的回答

madhan ravi
madhan ravi 2019-9-22
You probably have a variable named int, clear that workspace using:
clear int
%or
clear all

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