MATLAB: Making a matrix/vector using loop

columnsfor loopmatrixrowsvector

I am trying to make a matrixvector which can have particular number of rows and column with different columns or rows from the previous columns or rows using for loop. Can any one suggest some command to make this with an example if possible ?

Like i have a matrix 3*2 , i want to make it 3*3 by adding one more column with different element.

Similar for the vector as well.

Best Answer

M = rand(3,2); % 3x2 matrix
M_new = [M sum(M,2)]; % 3x3 matrix with 3rd column different from first two

Related Solutions

MATLAB: Unexpected numerical errors in matrix/vector multiplication

The dot product implementation might differ according to the input, i.e. dot product between two vectors as opposed between two matrices. Also, a quick search on the web exposes a few implementations of the dot product in the BLAS routines themselves and Matlab might be picking one or another according to different needs.

The example suggests zdotu.f

edit([matlabroot '/extern/examples/refbook/dotProductComplex.c']);

However, this doesn't tell us much about the dot product between matrices.

The difference in the results after startup calculation seems to be just chance. In fact, if you vary the number of random draws, the difference is not 0 anymore. To reset the state of the random generator without restarting, simply use

rng('default');

To address such a big discrepancy, we need to see what are the values of the dot products.

MATLAB: Making a point of data into matrix/vector form

You did not post any code, but this is not the first time this problem has presented here.

Subscript your ‘x’ and ‘y’ values in the loop, then plot them after the loop.

For example:

for k1 = 1:10
    x(k1) = k1.^2;
    y(k1) = 3 + 2*k1;
end
figure(1)
plot(x, y)
grid

Also, it is best not to use ‘i’ or ‘j’ as variables or loop counters in your code. MATLAB uses them for its imaginary operators, and using them as variables can be confusing.

Best Answer

Related Solutions

MATLAB: Unexpected numerical errors in matrix/vector multiplication

MATLAB: Making a point of data into matrix/vector form

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