MATLAB: Summing multiple variables and plotting them.

sum

Does anyone know how I might sum and plot the variables I have listed in my code?
Here is my code:
L = 1;
x = 0:L;
psi1 = sqrt(2/L)*sin((pi*x)/L);
psi3 = sqrt(2/L)*sin((pi*x)/L)-sqrt(2/L)*sin((3*pi*x)/L);
psi5 = sqrt(2/L)*sin((pi*x)/L)-sqrt(2/L)*sin((3*pi*x)/L)+sqrt(2/L)*sin((5*pi*x)/L);
psi7 = sqrt(2/L)*sin((pi*x)/L)-sqrt(2/L)*sin((3*pi*x)/L)+sqrt(2/L)*sin((5*pi*x)/L)-sqrt(2/L)*sin((7*pi*x)/L);
A = sum(psi1,psi3,psi5,psi7);
plot ((A),x,0,L)

Best Answer

A = sum([psi1,psi3,psi5,psi7]);  % Result:  1x1
% or 
A = sum([psi1;psi3;psi5;psi7]);  % Results: 1x2 (length of x)
The square brackets are missing.
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