Summing multiple variables and plotting them.

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)

Answer 1

[Adam Danz]

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.

[Matt Forrester]

Thank you!

Now when run the code, the plot doesnt have anything in it. Any idea how to get the plot to show.

[Adam Danz]

If you're using the 2nd line in my answer, and if you're using the plot() command in your question, you should see 1 line on the plot.

If you want to see the (0,L) point as well,

plot (A,x,'-',0,L,'o')

Now you'll see the line created by (A,x) and the point at (0,L).

[Matt Forrester]

Thank You!!!!

[Matt Forrester]

I also realized that I needed to change my x variable to

x = 0:0.1:L;

[Adam Danz]

I thought that looked fishy. Glad I could help.