Plot cells with variables?

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Sa Moha
Sa Moha 2021-12-8
回答： Awais Saeed 2021-12-9
Hi guys
I want to plot cells of a matrix. For example;
syms x;
A=[0;1;0;1];
A=A*x^2+A;
plot(x,A(2,1))
But it returns error for me.
Error using plot
A numeric or double convertible argument is expected
Can you please help?
Thank you!

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采纳的回答

Awais Saeed
Awais Saeed 2021-12-9
Ran in:
I think you want to plot the symbolic expression x^2+1 (that's what A(2,1) gives you). If that's the case, use fplot()
syms x;
A = [0;1;0;1];
A = A*x^2+A
A = 
fplot(A(2,1)) % its default interval is [-5 5].
title('plot of X^2+1')
ylabel('x^2+1')

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