![How to define a piecewise anonymous function - 2019 05 31.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/222232/How%20to%20define%20a%20piecewise%20anonymous%20function%20-%202019%2005%2031.png)
How to define a piecewise anonymous function
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Hello everyone,
the example code
syms x
continuous_function = x^2+x;
matlabFunction(continuous_function,'Vars',x)
gives me the anonymous function
@(x)x+x.^2
I would like a similar result for piecewise functions. However, the code
syms x
piecewise_function = piecewise( 0<x<1, x, 'otherwiseVal', 0 );
matlabFunction(piecewise_function,'Vars',x)
does not work.
Thanks for any help!
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Accepted Answer
Star Strider
on 31 May 2019
You need to use ‘logical indexing’:
piecewise_function = @(x) (x.^2+x) .* ((0<x) & (x<1));
x = linspace(-1, 2);
figure
plot(x, piecewise_function(x))
producing:
![How to define a piecewise anonymous function - 2019 05 31.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/222232/How%20to%20define%20a%20piecewise%20anonymous%20function%20-%202019%2005%2031.png)
6 Comments
ElPerroVerde
on 16 May 2020
THANK YOU SO MUCH!!!!!!!!!!!! I've been looking for something like this for months!!!
More Answers (1)
Walter Roberson
on 16 May 2020
If you use matlabFunction with 'file' option, then it will convert piecewise() into if/else in the generated code.
Note: because it uses if/else instead of logical indexing, the generated code will not be vectorized on that variable.
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