Hi everyone, I have a question, what does p by m by n matrix means,,,,as far as i know, m and n represents the order of matrix, number of rows and columns...what is the third one?

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Ayisha Nayyar
Ayisha Nayyar 2018-10-1
评论： Ayisha Nayyar 2018-10-1
Hi everyone, I have a question, what does p by m by n matrix means,,,,as far as i know, m and n represents the order of matrix, number of rows and columns...what is the third one?

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Walter Roberson
Walter Roberson 2018-10-1
The first coordinate is always the number of rows, no matter what it is named.
The second coordinate is always the number of columns, no matter what it is named.
The third coordinate is always the number of planes, no matter what it is named.
So a p by m by n matrix has p rows, m columns, and n planes.
For example, 480 x 640 x 3 has 480 rows, 640 columns, and 3 planes (and probably represents an RGB image)
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Walter Roberson
Walter Roberson 2018-10-1
2500 x 21 x 1 looks like it would be a valid size for frf.
Every 2D array is also a 3D array, 4D array, 5D array, and so on, so you do not need to somehow signal to MATLAB that your 2500 x 21 is "really" 3D.
For example look at the first example, https://www.mathworks.com/help/signal/ref/modalfit.html#bvkw6bh-4 . At the time of the modalfit, u is 1 x 3000, and u' is passed in the first parameter, so modalfit is being passed an frf which is 3000 x 1, also known as 3000 x 1 x 1.

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