# creation of matrices based on output

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okoth ochola el 22 de En. de 2023
Comentada: Walter Roberson el 22 de En. de 2023
Hi, I have the program below which when run gives extracted matrices with corresponding means. My problem is to tell the program to ouput all the means inside onesinlge matrix. Can someone assist me with this kindly. My input for A and B were A=[1 1 1 1 2 2 2 2 3 3 3 3]'; B=[3 4 6 7 8 9 0 12 4 5 6 8]';
%when this code is run and you input A and B which were (A=[1 1 1 1 2 2 2 2 3 3 3 3]'; B=[3 4 6 7 8 9 0 12 4 5 6 8]';)
A=input('input sample matrix\n');
B=input('enter the second matrix\n');
C=[A B];
for i=1:1:3
selectedRowsLogicalIndices = A == i;
subsetBdata = B(selectedRowsLogicalIndices)
mean(subsetBdata)
end
Below are the reulst that i got;
subsetBdata =
3
4
6
7
ans =
5
subsetBdata =
8
9
0
12
ans =
7.2500
subsetBdata =
4
5
6
8
ans =
5.7500
>>
I want all the means to be in matrix form like below;
ouput I want is below;
[5 7.25 5.75]'
or a matrix of all the subdatasets
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Walter Roberson el 22 de En. de 2023
output(i) = value
okoth ochola el 22 de En. de 2023
@Rik thank you, this tip just gave me a clue and it worked just right. Thank you so much.

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Sargondjani el 22 de En. de 2023
D(i,1) = mean(subsetBdata)
##### 2 comentariosMostrar NingunoOcultar Ninguno
okoth ochola el 22 de En. de 2023
What if I wanted to do the same with the vectors, kindly give some clue @Sargondjani
Walter Roberson el 22 de En. de 2023
output(i, :) = rowvector
output(:, i) = columnvector

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