MATLAB: How to select every nth value with the last value fixed from a column

nth last value

I have a column of 4901 values starting from a value of -25 (at first position) to a value of 8579 (at 4901 th position). Now I want to have a new column that should comprise of values after every 100 th number BUT the last value ( i.e., 8579) should remain in the new column

Best Answer

use

a = original_vector(1:100:4901);

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MATLAB: I am having matrix of i rows by 3 columns ,now i want to multiple only i rows of 1 columns with 5 upto 100th row after the 100th row ,values has to be as it is.

Let's assume that you want to multiply the first 'x' rows of the first column with a scalar 'n' and update the values in 'A'.

You can use the following command to do this:

>> A(1:x,1) = n*A(1:x,1);

If you want to do this for multiple columns (say first y columns) at once, you can do similar operation by indexing into columns also:

>> A(1:x,1:y) = n*A(1:x,1:y)

MATLAB: What is the elegent way to replace every Nth column in a matrix with another column

           B = randn(10,10);
           % replace every 3rd column with x
           x = randn(10,1);
           N = 3;
           indices = 1:N:size(B,2);
           x = repmat(x,1,length(indices));
           B(:,indices) = x;

Probably you are trying to replace a matrix which you get with A(:,1:n:end) with a vector. The sizes have to match.

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Related Solutions

MATLAB: I am having matrix of i rows by 3 columns ,now i want to multiple only i rows of 1 columns with 5 upto 100th row after the 100th row ,values has to be as it is.

MATLAB: What is the elegent way to replace every Nth column in a matrix with another column

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