Why does the line for my graph not appear?

%the code I'm using

clc;
clear all;
close all;
syms x
f = 5./((7+x).^2);
a=0;
for b = 1:13 
    w(b) = int(f,[a b]);
end
plot (b,w)
hold on
axis ([1 13 0 0.5])

Answer 1

[Star Strider]

The reason is that ‘b’ has only the value at the end of the loop, so a scalar.

Try this:

syms x
f = 5./((7+x).^2);
a=0;
b = 1:13;
for k = 1:numel(b)
    w(k) = int(f,[a b(k)]);
end
plot (b,w)
hold on
axis ([1 13 0 0.5])

The solution is to define ‘b’ as a vector and refer to the elements of it in the loop, then plot against it.