How to assign a vector with predefined data?

Question

israt fatema 2021-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/1440444-how-to-assign-a-vector-with-predefined-data

评论： israt fatema 2021-8-30

I need to a assign a n x n vector with data and use that vector to call a function. All example i found is for creating random or zero vector.

x size n x n (5 x 5) and n must equal length(y), and y size n x 1

A = [10695.88;10446.39;10082.36;9760.39;9390.26];

B = [10705.50;10439.13;10171.95;9794.65;9455.76];

x = vector of A with size 5 x 5 ?

y = vector of B with 5 x 1 ?

Thank you.

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Answer 1

Shanmukha Voggu 2021-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/1440444-how-to-assign-a-vector-with-predefined-data#answer_776884

在 MATLAB Online 中打开

Hi fatema,

I understand that you want to create a vector with predefined data instead of using zeros, ones, rand functions.

let's create a vector A(5 x 1)

A=[1;2;3;4;5]
A = 5×1
     1
     2
     3
     4
     5

let's create a vector B(5 x 5) from the predefined data(A)

B=A(:,[1,1,1,1,1])
B = 5×5
   1     1     1     1
   2     2     2     2
   3     3     3     3
   4     4     4     4
   5     5     5     5

The same result as above can be achieved by doing the following

RowCount = size(A, 1)
RowCount = 5
ColumnIndexes = ones(1, RowCount)
ColumnIndexes = 1×5
     1     1     1     1     1
B=A(:, ColumnIndexes)
B = 5×5
     1     1     1     1     1
     2     2     2     2     2
     3     3     3     3     3
     4     4     4     4     4
     5     5     5     5     5