Why does my plot not display when I use a nested loop?

I am trying to use the following code to iteratively plot various lines on a single graph:

hold on
for b=1:1:4
    for a=0:4:16
    c=a+24*b;
    plot (a, c)
    end
end
hold off

Why is my figure blank when I run it?

Answer 1

[Michael Haderlein]

If you want to get this as line plot, you'll need all values of a and c to be in one array each. If the example you have posted is the real equation, you should simply vectorize it and things become much easier:

b=1:1:4;
a=0:4:16;
[Am,Bm]=meshgrid(a,b);
Cm=Am+24*Bm;
plot(a,Cm)

If this was just sketching the problem and you cannot vectorize your function, you'll need to save all c values:

b=1:1:4;
a=0:4:16;
c=zeros(numel(a),numel(b));
for cntb=1:numel(b)
  for cnta=1:numel(a)
     c(cnta,cntb)=a(cnta)+24*b(cntb);
  end
end
plot(a,c)

[Mal]

Thank you! I get the plot I want by vectorizing the function.