Why do we usually use M,N,P to indicate dimensions?

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Vitaly 2011-7-28

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taken to indicate the dimension of the array m, n, p. the meaning of these letters I guess that m - main n -??? p - page?

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Paulo Silva 2011-7-28

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They are just variables when used like this:

[m,n,p] = size(rand(2,3,4))
m holds the first dimension (the number of rows)
n holds the second dimension (the number of columns)
p holds the third dimension of the array, think about it like the number of pages

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Paulo Silva 2011-7-28

just variables, no particular meaning, use the variables you like the most

Walter Roberson 2011-7-28

Historical habit in mathematics, just like using the beginning of the alphabet to represent constants and using the end of the alphabet to represent variables.

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karthika 2011-7-28

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m and p gives the number of rows and columns

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Vitaly 2011-7-28

as I know m and n gives the number of rows and columns, is any advantage to use p for columns due the best perfomance?

Walter Roberson 2011-7-28

No. The programming language doesn't care which variable name you use, but you will lose efficiency from people reading your code and attempting to figure out what your names mean. If you are going to use non-traditional names, use names that are self-explanatory.

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