# How can I plot two functions in the same graph?

4 views (last 30 days)
Wenchen Liu on 1 Nov 2022
Edited: Torsten on 1 Nov 2022
I have a code like this:
fplot(@(x) cosh(x))
hold on
p(x) = 0.6671x^3-1.7921x^2+2.7580x-0.089
fplot(@(x) p(x))
hold off
since p(x) is a more complex function. And when I try to run the code, the command shows "Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters,
or other syntax error. To construct matrices, use brackets instead of parentheses."
I don't know how to fix for this. Please me, thank you!

Torsten on 1 Nov 2022
Edited: Torsten on 1 Nov 2022
fplot(@cosh)
hold on
p = @(x)0.6671*x.^3-1.7921*x.^2+2.7580*x-0.089;
fplot(p)
hold off

Jim Riggs on 1 Nov 2022
Edited: Jim Riggs on 1 Nov 2022
Try this:
fplot(@(x) cosh(x));
hold on
fplot(@(x) 0.6671x^3-1.7921x^2+2.7580x-0.089);

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