How to make a curve fill the whole plotspace

Vb0_vec = [10 1000];
mb_vec = (20*10^-3)*(36*pi*Vb0_vec.^2).^(1/3);
rhog0 = 0.169;
lambda = 0.0173;
y = linspace(0, 120000, 50000);

% plot 3: beperkende factor voor capaciteit
W_10 = Capaciteit(y, Vb0_vec(1), lambda, mb_vec(1), rhog0);
W_1000 = Capaciteit(y, Vb0_vec(2), lambda, mb_vec(2), rhog0);

figure(3)
loglog(y, W_10)
hold on
loglog(y, W_1000)
hold off

The output looks like this:

How can i make the curves cover the whole plot (touching both axes)?

Answer 1

[Walter Roberson]

You have the same y each time, but the visible coverage is different. For log plots the implication is that the data either becomes non-finite or becomes negative.

[min10, max10] = bounds(y(isfinite(W_10) & (W_10>0)));
[min1000, max1000] = bounds(y(isfinite(W_1000) & (W_1000>0)));
minb = min(min10, min1000);
maxb = max(max10, max1000);
xlim([minb, maxb]);

Answer 2

[Mathieu NOE]

hello

try this :

have log spaced x vector (with power of 10 limits) should do the job (fastest fix)

and 500 to 1000 points should be enough to get a good quality plot

Vb0_vec = [10 1000];
mb_vec = (20*10^-3)*(36*pi*Vb0_vec.^2).^(1/3);
rhog0 = 0.169;
lambda = 0.0173;
% y = linspace(0, 120000, 50000);
y = logspace(1, 5, 1000);

% plot 3: beperkende factor voor capaciteit
W_10 = Capaciteit(y, Vb0_vec(1), lambda, mb_vec(1), rhog0);

Unrecognized function or variable 'Capaciteit'.

W_1000 = Capaciteit(y, Vb0_vec(2), lambda, mb_vec(2), rhog0);
figure(3)
loglog(y, W_10)
hold on
loglog(y, W_1000)
hold off

[Arne]

Thank you for your answer. Your suggestion fixes the problem on the left side. On the right side however the graphs don't go all the way down to zero. I think i would need a way to have the points on the right side be closer to eachother.

[Mathieu NOE]

hello again

can you share your function Capaciteit ?