How to take the absolute value for 2D spectrum?

I have 2D spectrum with positive(blue) and negative(red) signals, I want to make all signals positive and to save the received spectra.

How to make it? (thank you in advance)

Answer 1

[Hiro]

try function "abs":

t=-pi:0.01:pi

t = 1×629

-3.1416 -3.1316 -3.1216 -3.1116 -3.1016 -3.0916 -3.0816 -3.0716 -3.0616 -3.0516 -3.0416 -3.0316 -3.0216 -3.0116 -3.0016 -2.9916 -2.9816 -2.9716 -2.9616 -2.9516 -2.9416 -2.9316 -2.9216 -2.9116 -2.9016 -2.8916 -2.8816 -2.8716 -2.8616 -2.8516

y= sin(t);
plot(t,y);

y2 = abs(y);
plot(t,y2);

?

[Ilya Grishanovich]

Thanks, I'll try.

Answer 2

[Matt J]

spectra=abs(spectra)

[Ilya Grishanovich]

Thanks, I'll try.