Select Specific Values in Matrix Based on Index Values Listed in Array...

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Michelle De Luna
Michelle De Luna 2020-2-10
回答： Sindar 2020-2-10
Good afternoon!
I had a question regarding filtering/selecting specific values within a matrix based on the values listed in an array. For example, I have an array ('b') with thousands of random numbers in ascending order representing the index value of data located in an nc file (i.e. array 'b' contains the numbers 1, 5, 7, 10, 25, 60, 89, and thousands more, and each of these represents the index value of a timestep in a separate nc file). The end goal is to use array 'b' to select the timesteps in my nc file for further use. Would I use the "ismember" function? Or "find"? Or should I use a for-loop instead? Any help would be greatly appreciated. (And I apologize in advance for my incessant questions...)
b = array with 12,000+ values representing index values in nc file

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Sindar
Sindar 2020-2-10
Actually, you can index directly with 'b' after loading your variable into 'a':
a(b,:)
It may be possible to only load the rows corresponding to b; if you want this, include your code that reads in the nc file

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