How to store a matrix, A, in variable X, where X is also carrying a counter "i"

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Neeraj Kumar 2020-9-16

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评论： Neeraj Kumar 2020-9-16

采纳的回答： Ulli Srinivasu

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I have a matrix A, which I want to store in a varaible X.

Now I can do,

X=A;

But the varaible is X is having a counter i, beacuse the value of X variable in one iteration will be used in the next iteration and so on.

So, it put a counter like this;

X(i)=A;

But, in the above line, the indices error - Unable to perform assignment because the indices on the left side are not compatible with the size of the right side - is shown.

What should be the correct syntax, plaease tell me.

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Ulli Srinivasu 2020-9-16

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Hi Neeraj,

simply create a structure.

X = struct();

X(i).A = A;

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Ulli Srinivasu 2020-9-16

use x(j-1).A, x(j).A, x(j+1).A

Neeraj Kumar 2020-9-16

It worked!! Thanks Ulii Srinivasu!!

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Sindar 2020-9-16

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Simple way: add a third dimension, "pages":

X(:,:,i) = A;

But, if you only need the last iteration, it's better to store just the current and last iteration. Something like:

n=10;
m=4;
X_new = rand(n,m);
for ind=1:10
    X_old = X_new;
    X_new = X_old.^2;
end

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Walter Roberson 2020-9-16

What you are seeing displayed is not two matrices, it is a way to represent a multidimensional matrix of numeric values on the command window.

I would suggest that you use SIndar's X_old strategy.

Neeraj Kumar 2020-9-16

编辑：Neeraj Kumar 2020-9-16

Ok, i will try this X_old strategy. Thanks Walter! Thanks Sindar!

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