Plot from a matrix in matlab

Question

I want to create a multi-plot from each array of matrix y:

q = [...] % (a 1x6 matrix)
p = [...] % (a 6x6 matrix)
x = [0:1:40];
y = q * p ^ x;

But I get this error:

Error using  ^ 
Inputs must be a scalar and a square matrix.
To compute elementwise POWER, use POWER (.^) instead.

http://fr.mathworks.com/help/matlab/learn_matlab/matrices-and-arrays.html — shamalaia
– shamalaia, Commented Jun 25, 2016 at 7:13

percusse · Accepted Answer · 2016-06-25 11:16:30Z

1

To avoid blow-ups in power computations, do not compute the powers explicitly but instead use intermediate results

y = zeros(41,6);
y(1,:) = q;
for ind = 1:40
    y(ind+1,:) = y(ind,:)*p;
end

answered Jun 25, 2016 at 11:16

percusse

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Comments

User1551892 · Accepted Answer · 2016-06-25 08:00:20Z

0

q = [...] ( a 1x6 matrix)
p = [...] ( a 6x6 matrix)
x = [0:1:40];
y = [] ;
for i = 1 : length (x)
    y(i,:,:) = q * p .^ x(i);
end

q * p will generate the matrix of size of 6 x 6. y will be 3 dimensional matrix of size of 41 x 6 x 6.

answered Jun 25, 2016 at 8:00

User1551892

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Muhammad Usman Saleem · Accepted Answer · 2016-06-25 08:05:04Z

0

try to fix this line as

for k=1:40
y = q * p ^ k;
end

also you can do this as

for k=1:40
y = q * p ^ x(k);
end

also it will takess power of p as x then multiple q * p ^ x;

answered Jun 25, 2016 at 8:05

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