# replacing values from one array to another in different sizes

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Morten Jørgensen on 27 Mar 2019
Commented: Morten Jørgensen on 27 Mar 2019
Hi
I am really struggeling with solving this problem.
% I have an array called mBall 15001x4 with only zeroes in fourth column
mBall(1:15001,4) = 0;
-3.42 -24.55 5.19 0
-3.01 -24.59 5.66 0
-2.59 -24.64 6.11 0
-2.19 -24.69 6.53 0
-1.78 -24.73 6.91 0
-1.38 -24.79 7.28 0
-0.98 -24.84 7.63 0
% this is what an exsample of what my mBall looks like
% I have an array c that consist of 3786x2, below is an exsample of c
% The fist column in c, should be corresponding to the row nr in mBall
c =
2 1
3 1
4 2
5 3
7 3
% I'm trying to replace the values in fourth column of mBall, with the values in second column of c
% mBall should look like this afterwards
mball =
-3.42 -24.55 5.19 0
-3.01 -24.59 5.66 1
-2.59 -24.64 6.11 1
-2.19 -24.69 6.53 2
-1.78 -24.73 6.91 3
-1.38 -24.79 7.28 0
-0.98 -24.84 7.63 3

Image Analyst on 27 Mar 2019
Try
rowsToReplace = c(:, 1);
mBall(rowsToReplace, 4) = c(:, 2);
Morten Jørgensen on 27 Mar 2019
Thank you so much
this works