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I want to plot a curve between err and b for different values of b.

- I have kept the values of i to be a constant for the inner iteration, and I want to sum up the error ( square )
- In 'o' and 'p'for different values of 'i' and finally I want to plot err vs b. such that i get a minimum to this curve at a certain 'b'.

sum =0;

err =0;

for b= 0:1:40

for i= 0:1:50

f1 = @(o,i) (sind(b+i) + sind(b-o)) -( 1.180/0.04 + sqrt.((1.140/0.04 - 2*sind(b)).^2 - (cosd(b-o)- cosd(b+i)).^2));

f2 = @(p,i) cotd(p-3.34) - cotd(i-1.07) - (1.180/(1.540 - 0.300));

sum = sum + (o - p).^2;

end

err = sqrt(sum/50);

plot (b,err);

hold on

end

Walter Roberson
on 21 Jan 2018

total = 0;

err = 0;

bvals = 0:1:40;

for b = bvals

subtotal = 0;

for i= 0:1:50

f1 = @(o,i) (sind(b+i) + sind(b-o)) -( 1.180/0.04 + sqrt.((1.140/0.04 - 2*sind(b)).^2 - (cosd(b-o)- cosd(b+i)).^2));

f2 = @(p,i) cotd(p-3.34) - cotd(i-1.07) - (1.180/(1.540 - 0.300));

subtotal = subtotal + (o - p).^2;

end

err = sqrt(subtotal/50);

plot(bvals,err);

hold on

total = total + subtotal;

end

But why do you define f1 and f2 when you do not use them? And you have not defined o or p but you try to add their squared difference to the total?

Image Analyst
on 21 Jan 2018

And even if you did use them, why do you want them to be defined inside a loop instead of at the top of your program?

And don't use sum as the name of your variable since it's a built in function.

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