how to multiply a number to matrix?

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Aarti Soni 2022-7-18

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评论： Bruno Luong 2022-10-15

Hello everyone,

I have a matrix 180X360X1332 (Latitude X Longitude X Time). I want to multiply 30 at every fourth number of third demension (e.g., 1,5,9,13......1332)

I have tried this for vector data:

Y = 30*(1:4:1332);

How can I do this for matrix data?

Thanks

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Aarti Soni 2022-7-18

@Bruno Luong I have updated my question. Hope this is clear now.

Bruno Luong 2022-7-18

If that is the case, see @vishweshwar samba answer

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采纳的回答

vishweshwar samba 2022-7-18

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编辑：vishweshwar samba 2022-7-18

在 MATLAB Online 中打开

I assume that the matrix 180X360X1332 (Latitude X Longitude X Time) is a multidimentional array and you want to multiply a value of 30 to (Latitude X Longitude) in the interval of 4 wrt Time.

% By using the below for loop, created a matrix 'A' of dimension 180x360x1332 (Latitude X Longitude X Time)
for i = 1:1332
    A(:,:,i) = ones(180,360);
end
% Now multiply a number 30 in time dimension at interval of 4(1:4:1332)
A(:,:,1:4:1332) = A(:,:,1:4:1332)*30;

I have one more question in this regard, suppose, I have a time series (1x48) and I want to extract values at particular interval. Means, I want to creat a new time series which will have only 12 values. e.g., 1,5,9,13,17, 21, 25, 29, 33, 37, 41, 45

How can I do this?

Thanks

Bruno Luong 2022-10-15

@Aarti Soni I suggest you to create a new thread and better description. Someone else can answer to you.

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