MATLAB: For Loop with matrices

forfor loophelploopmatrixmatrix manipulation

Hello!

I have these matrices:

x(0)=[1;2] and  x(1)=A*x(0), where A=[1 3;4 5]

How can I create a for lopp to obtain:

x(2)=A*x(1) 
x(3)=A*x(2)
....

Thanks for your answers!!!!

Best Answer

One approach:

A=[1 3;4 5];
x(:,1)=[1;2];
N = 10;
for k = 1:N
    x(:,k+1) = A*x(:,k);
end

You simply need to be careful to provide the correct indexing.

Experiment to get the result you want.

Related Solutions

MATLAB: How to create a vector with for loop

Hamzah - on each subsequent iteration of your loop, you are overwriting the data from the previous iteration since you are setting vt to something new. You need to concatenate the new data with the previous data so that you don't lose anything. Try the following:

x = [1,4,-1,5,0,2];
vt = [];
for k=2:length(x)
    if x(k) > x(k-1)
        vt = [vt x(k-1):0.1:x(k)];
    else
        vt = [vt x(k-1):-0.1:x(k)];
    end
end

MATLAB: Can you index matrices

The following:

 M(5:8, 3:7)

is an array that corresponds to the block defined by rows 5 to 8 of M and columns 3 to 7. As these ranges can be defined by vectors/arrays content, you can build flexible solutions for block-indexing M.

 rIds = ... ;           % rIds and cIds could be defined as a function of a loop
 cIds = ... ;           % index variable, e.g. based on vectors of block 
                        % boundaries in terms of row IDs and column IDs:
                        % rIds = rBoundaries(ii):rBoundaries(ii+1) ; ..
 block = M(rIds, cIds) ;

If you wanted your blocks to be stored separately in a cell arrays, you could use the function mat2cell(). It would take M as a first arg and essentially the two vectors of block boundaries mentioned above as second/third args.

Best Answer

Related Solutions

MATLAB: How to create a vector with for loop

MATLAB: Can you index matrices

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