creation of matrices based on output

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okoth ochola 2023-1-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1898395-creation-of-matrices-based-on-output

评论： Walter Roberson 2023-1-22

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 =

ans =

subsetBdata =

ans =

7.2500

subsetBdata =

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 2023-1-22

output(i) = value

okoth ochola 2023-1-22

@Rik thank you, this tip just gave me a clue and it worked just right. Thank you so much.

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采纳的回答

Sargondjani 2023-1-22

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1898395-creation-of-matrices-based-on-output#answer_1153720

D(i,1) = mean(subsetBdata)

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okoth ochola 2023-1-22

What if I wanted to do the same with the vectors, kindly give some clue @Sargondjani

Walter Roberson 2023-1-22

在 MATLAB Online 中打开

output(i, :) = rowvector
output(:, i) = columnvector

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类别

MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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版本

R2016a

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