How to put max function in symbolic function

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Mohamed Gaballah
Mohamed Gaballah 2021-1-13
评论： Mohamed Gaballah 2021-1-13
I want to make a symbolic function where
f(x)=max(0,x)={0 x<0
x x≥0 }
how to do it?
syms x
f = max(0,x)
It gives me an error: Input arguments must be convertible to floating-point numbers.

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回答（1 个）

Birdman
Birdman 2021-1-13
Why would you try to name it as max? Simply, piecewise function in Symbolic toolbox would help you:
syms x
f(x)=piecewise(x<0,0,x>=0,x);
ıf you want to plot for specific inputs to test the function
x=-2:0.1:2;%random input
plot(x,f(x))
  1 个评论
Mohamed Gaballah
Mohamed Gaballah 2021-1-13
Isn't there an equivilant in Matlab 2016a , as it gives me "Undefined function or variable 'piecewise'."

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