How do I plot this to display a spectrum?

I want to plot the intensity against wavenumber.

This is the intensity i believe:

But i dont understand what's val(:,:,1) this runs till val(:,:,729)

and this is the wavenumber:

and it runs from 1 to 729

i tried to plot x = wavenumber and y = ref_Raw and plot (x,y)

however it was reflected

??? Error using ==> plot Data may not have more than 2 dimensions

do need help with this!

thanks

Answer 1

[Rick Rosson]

x = wavenumber;
y = transpose(squeeze(ref_raw));

plot(x,y);

Answer 2

[hithere]

Thanks alot!

But may I roughly know i would need to transpose. and whats the purpose of squeeze command?

thanks!

[Rick Rosson]

The variable ref_raw is a 25 x 1 x 729 array. To verify, please type

   size(ref_raw)

at the command prompt. In MATLAB, this array has 3 dimensions:

   ndims(ref_raw)

The plot function does not allow arguments that have more than 2 dimensions. But notice that the size of the middle dimension is exactly 1. As a result, it is unnecessary. In MATLAB, this dimension is called a singleton dimension. The squeeze function eliminates singleton dimensions.

In this case, the result of calling squeeze is to convert raw_ref to a 25 x 729 array, which is 2D and contains all of the same numeric values.

Finally, the transpose simply converts the array to 729 x 25. The reason the transpose is necessary is because the plot function treats each column as an independent data series. Because the wavenumber variable contains 729 values, I inferred that you wanted to plot 25 different spectra, each consisting of 729 values.

[hithere]

Thanks mate! Sorry for the trouble, im still learning.

Thanks alot!

[Rick Rosson]

No need to apologize. We are all still learning. When we stop learning, then it's time to throw in the towel!