??? Error using ==> colon Colon operands must be in range of the data type.

HI,

I have a matrix of size "res<1*11969>". I would like to retrieve the values from index 900 to 11969 automatically. When I gave like this

mStart=900;

mEnd=11969;

res(:,[mStart:mEnd]) it shows an error " colon Colon operands must be in range of the data type" .

It will run if I gave res(:,[900:mEnd]).

But if I give res(:,[mStart:11969])it will shows the same error.

Kindly help in this issue as I would like to pass the values with variables.

Don

[Azzi Abdelmalek]

This works fine

[Shuba Nandini]

Hi,

I have tried to reproduce the code on my end and it is working fine without any errors. As a workaround, you can try to retrive the values for specific range of matrix using the following command:

trimmedMatrix = res(:,mStart:mEnd)

[DGM]

The error seems to be happening because the requested range of values does not lie within the range available to the inherited integer class.

This can happen if the arguments are a mix of float classes and (at most one) integer class. In this scenario, the output class (and the range of possible values) are inherited from the integer class present in the input arguments.

For example:

a = uint8(64); % one argument is uint8, so that's what the output must be
b = 512; % the other is double float
x = a:b % but 512 is not in the range of uint8 [0 255]

Error using :
Colon operands must be in the range of the data type.

That said, I don't know how it would be possible to cause this error with arguments of 900 and 11000. Neither are within the range of 8b integer classes, and both are within the range of 16b integer classes. There is nothing in the given code which would imply that either are integer-class at all.

I can't think of a reason that could implicate the : used for the dim1 subscript.

[Walter Roberson]

If we suppose that

mStart = uint8(900)
mEnd=11969

then mStart:mEnd would be an error.

Of course 900 saturates uint8 and would be the value uint8(255) -- but it is not an error to saturate uint8, so perhaps it was not noticed that it was happening.