MATLAB: Rand in matrix

#matrix #randMATLAB

Is it possible to use rand in a matrix and include a range? I know it is possible with a vector, but I wanted to see if it was possible in a matrix. Thank you!

Best Answer

result=-min_value + (max_value+min_value)*rand(m,n);

Example:

%Let say range -0.6 to 0.8 and matrix size 5x4
result=-0.6 + (0.8+0.6)*rand(5,4)

Result:

result =
    0.1382   -0.0979    0.2944    0.0736
   -0.4558    0.2558   -0.1577   -0.5351
    0.0320    0.5944   -0.4910    0.1707
   -0.1773    0.5954   -0.5836   -0.1201
    0.2625    0.1651    0.2922   -0.5717

Related Solutions

MATLAB: Is this not outputting anything

For this to work you need to set your intial MIN_VALUE to inf rather than 0. If its set to zero, it will only make output if you send it a negative number, otherwise it will never go into that if statement.

function output = MyMin(x)
MIN_VALUE=inf;
for i=1:length(x)
    if MIN_VALUE>x(i)
        MIN_VALUE=x(i);
        index=i;
        output = [MIN_VALUE, index];
    end
end
end

MATLAB: How to get the coordinates of the minimum and maximum value

Use the second return argument of max and min:

[minValue, indexOfMinValue = min(d);
[maxValue, indexOfMaxValue = max(d);

That essentially gives you [y, index]. To get x and y:

xMin = x(indexOfMinValue);
yMin = minValue;
xMax = x(indexOfMaxValue);
yMax = maxValue;

Best Answer

Related Solutions

MATLAB: Is this not outputting anything

MATLAB: How to get the coordinates of the minimum and maximum value

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