How to seperate positve and negative x axis

Hello,

I have a function and I want to examine the curve of the function only for positive x values.

Does anyone have an ideo how i could do that?

I attached an image of how my function looks.

Answer 1

[Star Strider]

Try this:

F = openfig('Bild_versch.fig');
Lines = findobj(F, 'Type','Line');
X = Lines.XData;
Y = Lines.YData;
LM = X > 0;                                             % Logical Mask: Only Positive ‘X’ Values

figure
plot(X(LM), Y(LM))
grid
xlim([0  0.005])                                         % Optional

Note that since 0 has no sign, it is not considered to be either positive or negative. To include it, change the ‘LM’ assignment to:

LM = X >= 0;                                            % Logical Mask: Only Non-Negative ‘X’ Values

[Antonio Sarusic]

Yeah this works, thank you.

I asked the question a bit badly.

I need to do the exact same thing but not with the image.

Do you know how to do this with two vectors?

I attached them.

I get the plot with:

plot(x_Fv,fftshift(x_F));

[Star Strider]

Just change my code to:

xd = load('x_Fv.mat');
yd = load('x_F.mat');
x_Fv = xd.x_Fv;
x_F = yd.x_F;
x_Fs = fftshift(x_F);                                    % Create Shifted Variable
LM = x_Fv > 0;                                           % Logical Mask: Only Positive ‘X’ Values

figure
plot(x_Fv(LM), x_Fs(LM))
grid
xlim([0  0.005])                                         % Optional

I always load .mat files into variables because they can contain anything and I want to control my workspace.

[Antonio Sarusic]

Thank you very much

[Star Strider]

As always, my pleasure!