how to create matrix with multiple column vectors?

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prabhabathi devi chandrasekaran 2018-2-21

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编辑： Pawel Jastrzebski 2018-2-21

I have to create channel matrix for 16 users. each column contains information about channel of particular user.my matrix size will be 128x16

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prabhabathi devi chandrasekaran 2018-2-21

No, not like that. I have combine all 128x1 column vectors into single matrix for further implementation.I found the answer thanks for your response.

Stephen23 2018-2-21

"I have combine all 128x1 column vectors into single matrix for further implementation"

Storing them in one array right from the very beginning would be simpler, neater, and more efficient: most like this could be achieved using some basic indexing. Keep data together as much as possible always makes processing that data simpler.

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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Answer 1

Pawel Jastrzebski 2018-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/383888-how-to-create-matrix-with-multiple-column-vectors#answer_306253

编辑：Pawel Jastrzebski 2018-2-21

在 MATLAB Online 中打开

Regarding 'information about channel of particular user':

Is it all numerical values?
Is it mixed data i.e. channel 1 holds a number and channel two a text?

In case 1, you can use a solution as simple as matrix or table to store your information.

Consider the following example:

NoOfUsers    = 16;
NoOfChannels = 128;
% 1) MATRIX
% create an empty matrix
M_UserChannel(NoOfChannels,NoOfUsers) = 0;
% 2) TABLE
T_UserChannel = array2table(M_UserChannel);
% CREATE COLUMN NAMES and ROW NAMES
% preallocate memory for the user names
users{1,NoOfUsers} = [];
for i=1:NoOfUsers
    users{1,i} = ['user' num2str(i)];
end
clear i;
% preallocate memory for the channel names
rows{1,NoOfChannels} = [];
for i=1:NoOfChannels
    rows{1,i} = ['channel' num2str(i)];
end
T_UserChannel.Properties.VariableNames = users;
T_UserChannel.Properties.RowNames      = rows;
clear i rows users;

If the data is mixed, you can still use Matlab's table to store the information, on condition that:

Users are stored in rows
Channel information is stored in column (as columns within one table can hold data of various types - as long as you stick to one data type per column)