2d plot from 1d plot

Hello all.

I have one vector as a function of x of length 1220 point and another vector as a function of y of length 1933 point. These points are arbitrary measure of my x and y distance respectively. I want to multiply them together to get a third vector of x and y, then I want to plot with x and y. Any help how can I do it will be appreciated.

[omnia]

Note that my x and y distance are different from each other.

Answer 1

[Star Strider]

‘Note that my x and y distance are different from each other.’

The interp1 function is your friend here.

[omnia]

yes but how I can multiply them? they are of different sizes as x distance and y distance are different?

[Star Strider]

It depends on how you want to ‘multiply’ them. You can certainly create a (1220 x 1933) matrix, but if you want to do element-wise multiplication, they have to have the same lengths. That is the reason I suggested interp1 as a way to equalise their lengths.

How you want to do that is your choice.

[omnia]

I can make them of the same length but the resolution will not be the same for both of them. If I skip this point how can I draw them with x and y?

[Star Strider]

It depends on what you mean by ‘resolution’. In engineering, it’s frequently necessary to make compromises to accommodate the constraints of the problem.

If you want to multiply them using element-wise operation, the two vectors must both have the same number of elements.

As Walter Cronkite (a U.S. television presenter) used to say, ‘That’s the way it is.’

[omnia]

let me describe the problem in better way. I have two field, one in x direction described over length w, and the other in y described over range h. I have two plots of them which I am attaching. What I want to do is multiply them together over the rectangle of area w*h. My question is how to multiply them?

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[Star Strider]

I can’t suggest anything other than what I already posted. It seems to me that you are doing matrix multiplication, so that something like this is what you want:

m = w(:) * h(:)';

This will produce matrix ‘m’ that has ‘length(w)’ rows and ‘length(h)’ columns.