# Matlab for Loop of two changing variables

• MATLAB
Hi,
Please I need your assistance on this matlab code. I will really appreciate it.

R=0.492; Pw=0.3708;

for r=1:5;

for teta=10:10:360;

sigmar=(1-(R.^2./r.^2))+(1-((4.*R.^2)./r.^2)+((3.*R.^4)./r.^4)).*cos(2.*teta)+(1-((4.*R.^2)./r.^2)+((3.*R.^4)./r.^4)).*sin(2.*teta)+Pw.*(R.^2./r.^2);

end

end

The only constraint is that for each time r changes, I want the loop to calculate value for sigmar with teta going form 10-360 with increament of 10 (teta=10:10:360).
To make it clearer, What I want is that, I want the code to take r=1, calculate 36 values for sigmar using teta=10:10:360, then take r=2, calculate 36 values for sigmar using teta=10:10:360, then take r=3, calculate 36 values for sigmar using teta=10:10:360, then take r=4, calculate 36 values for sigmar using teta=10:10:360, then take r=5,calculate 36 values for sigmar using teta=10:10:360.

Best regards,

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Are you asking how to store the variables so that it doesn't get overwritten each time? If so, you could probably do that using cell arrays/structures/arrays

For example:
rndx = 1;

for r=1:5;
tetandx = 1;
for teta=10:10:360;

sigmar= ...
data(1,tetandx,rndx) = sigmar;

tetandx = tetandx + 1;
end
rndx = rnd + 1;
end

Hi Gringo,

Yes. What I want is that I want calculated values of sigmar to be stored and not over-written at each value of r and teta=10:10:360.

Once again thanks

Hi Gringo,

I want to make polar plot of the value of r and sigmar. polar(r,sigmar). Please how do I write the code so that I will have at each r (from r=1 to r=5) all the sigmar values corresponding to 36 teta values plotted in polar coordinate.

I am very grateful

Best regards,

chiro
Hi Gringo,

I want to make polar plot of the value of r and sigmar. polar(r,sigmar). Please how do I write the code so that I will have at each r (from r=1 to r=5) all the sigmar values corresponding to 36 teta values plotted in polar coordinate.

I am very grateful

Best regards,