# How to plot a function dependent on no. of iterations, provided it plots till nth iteration where n is the number where the function is converged?

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ISHA ARORA on 28 Jan 2022
Edited: VBBV on 29 Jan 2022
Hello All,
I am trying to plot a function vs no. of iterations. In the for loop, i have given the convergence condition, but I am unable to plot for f(x) vs no. iterations (till convergence). Please help.
Its of the form:
for m=1:n
pu(m)=(-1)^m)/((2*m)+1))*(exp(-((2*m)+1)))
e = e+pu;
if (abs(pu)/e)<(10^(-6)) %convergence check
break
end
end
hold all
plot(1:n,pu,'linestyle','none','marker','*')

VBBV on 28 Jan 2022
Edited: VBBV on 29 Jan 2022
n= 10;
e = 0;
for m=1:n
pu(m)=(-1)^m/((2*m)+1)*(exp(-((2*m)+1)))
e = e+pu(m);
if (abs(pu(m))/e)>(10^(-6)) %convergence check
break
end
end
pu = -0.0166
pu = 1×2
-0.0166 0.0013
pu = 1×3
-0.0166 0.0013 -0.0001
pu = 1×4
-0.0166 0.0013 -0.0001 0.0000
pu = 1×5
-0.0166 0.0013 -0.0001 0.0000 -0.0000
pu = 1×6
-0.0166 0.0013 -0.0001 0.0000 -0.0000 0.0000
pu = 1×7
-0.0166 0.0013 -0.0001 0.0000 -0.0000 0.0000 -0.0000
pu = 1×8
-0.0166 0.0013 -0.0001 0.0000 -0.0000 0.0000 -0.0000 0.0000
pu = 1×9
-0.0166 0.0013 -0.0001 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000
pu = 1×10
-0.0166 0.0013 -0.0001 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000
hold all
plot(1:n,pu,'linestyle','-','marker','.')
Check the convergence condition
VBBV on 29 Jan 2022
u=zeros(n,npoints); % change also This line in beginning
u(m,cidx)=pu(m);
hold all
plot(1:m,u(1:m,cidx),'linestyle','none','marker',mrkr{cidx},'Color',clr{cidx})
You also need to change these two lines inside the for loop. As you can see the u value is dependent on pu which is again varying with each outer iteration of for loop.