Adding an outer for loop for a plot

I have the following code:

eta = 0.4;
eta_c = 0.6;
rpf = eta/eta_c;
count = 0;
for x = 1:0.01:1.5
    count = count + 1;
    z(count) = g(x,rpf);

end

 x= 1:0.01:1.5;
 plot(x,z,'-')
 grid on;

It does what I want. My question though is, how can I do an outer loop to also loop over eta? What if I want to have different values of eta, but not in any incremental order (4.0, 4.2, 4.7) etc. and then plot them all on the same graph with a hold on or something? Anyone know how I can do this? Assume my function is correct that is called

Answer 1

[Bob Nbob]

eta = [5.4 6.7 5.2];
hold on
for i = 1:length(eta);
    eta_c = 0.6;
    rpf = eta(i)/eta_c;
    count = 0;
    for x = 1:0.01:1.5
        count = count + 1;
        z(count) = g(x,rpf);

    end
    plot([1:0.01:1.5],z,'-')
    grid on;
end

You could have a very similar loop for eta_c if you want to vary those values as well.

I changed your plot x values because while defining x works for when you just have the one loop, it would be better not to keep changing the size and value within the outer loop. It shouldn't directly cause a problem, but better safe than sorry.

[Benjamin]

thanks it works!

Answer 2

[per isakson]

This is may approach. (Don't change the code that works.)

function    cssm( )
    eta = [ 4.0, 4.2, 4.7 ];
    for e = eta
        cssm_( e )
        hold on
    end
end
function    cssm_( eta )
    eta_c = 0.6;
    rpf = eta/eta_c;
    count = 0;
    for x = 1:0.01:1.5
        count = count + 1;
        z(count) = g(x,rpf);
    end
    x = 1:0.01:1.5;
    plot(x,z,'-')
    grid on;
end
function    out = g( x, rpf )
    out = x + rpf;
end

It works but the hold-part asks for improvement. Then refine the code if (and only if) it's needed.