MATLAB: How would I create a 6×6 matrix with evenly distributed values from -10 to 10

matrixmatrix manipulation

I know a long way, by typing out the exact values, I was just curious as to if there was a more efficient way.

Best Answer

Not entirely sure how you want the values distributed (by row or column), but see if this helps:

Msize = 6;
n = Msize^2;
values = linspace(-10,10,n);
matrix = reshape(values,Msize,Msize);

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MATLAB: How to Add Values from One Matrix in between the values of another

This works:

a = [ 1 3 5 7 9 11];
b = [ 2 4 6 8 10];
c = zeros(1, numel(a)+numel(b));
c(1:2:end) = a;
c(2:2:end) = b;
c =
     1     2     3     4     5     6     7     8     9    10    11

MATLAB: How to make a for loop that goes from -10 : 10

MATLAB does not use range() . Your second version is correct.

However, you will probably want to store the results of each iteration. In this case you would have to store into Output(X+11, Y+11) . In the more general case where you might not be incrementing by 1, you should learn a different pattern:

xvals = -10:.12345:10;   %your increments might not be integer so it might be difficult to compute indices
nx = length(xvals);
yvals = randn(size(xvals));  %you might not have any fixed increment at all, might not be ordered
ny = length(yvals);
Output = zeros(nx, ny);
for xidx = 1 : nx
  x = xvals(xidx);
  for yidx = 1 : ny
    y = yvals(yidx);
    ...
    Output(xidx, yidx) = ...
  end
end

with this general pattern, the values to be processed do not have to be consecutive or even ordered, but this code will handle all of the combinations.

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Related Solutions

MATLAB: How to Add Values from One Matrix in between the values of another

MATLAB: How to make a for loop that goes from -10 : 10

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