MATLAB: Using min() on vectors with double

decimalsdoubleminvectors

I have several variables of the double type, each around 450×1 in size. I would like to find the minimum value of each of them, but when I use min(vector), MATLAB returns "Subscript indices must either be real positive integers or logicals." Does this mean that min() cannot work with decimals? If so, is there another function I can use that will? An example of my code is below. As you can see, I have set up a matrix that has two columns, one with a single integer and another with the minimum value of the vector.

min_set = [974,min(blg0974);975,min(blg0975);976,min(blg0976)];

Update: All my vectors have positive values with decimal places up to the ten thousandth's place.

Best Answer

Kylie - try typing

 which min

to see if min refers to the function to find the minimum value of an array or if min refers to a local variable. If you are seeing the above error message when you call min(vector), then this suggests that you are trying to access elements in an array named min with non-integer indices (which would be the floats or doubles in your vectors/arrays). If this is the case, then you can easily fix this problem by renaming your local variable to something else which will not correspond to a built-in MATLAB function.

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min(outFHN)
ans =
     -4.1601

I would assume that you have a variable called min in your workspace which is shadowing the min function

MATLAB: Getting error when asking from max and min for negative values.

Sounds like you may be trying to index into the array using the min or max value instead of the index:

mn = min(data);
minValue = data(mn);

Don't do that. Use both values if you want to get the index. A better way:

[minValue, indexOfMin] = min(data);
[maxValue, indexOfMax] = max(data);

Or you may have used min for the variable

min = min(data);  % Horrible idea

in which case when you came along and tried to do it again, it would have used your min array (a vector is data was a 2-D array) as indexes into your newly created min array. min() is no longer the min function if you replaced it with a variable of the same name. So if the min was now an array of column mins because you stored the mins in an array called min, then doing min(data) will throw that error if any elements of data have negative, zero, or floating points (fractional) values.

Best Answer

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MATLAB: Is the min() and max() function throwing an error

MATLAB: Getting error when asking from max and min for negative values.

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