How to convert a matrix of double to int?

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Emilie Mussard
Emilie Mussard 2013-12-5
评论： Macro 2024-1-2
I need to convert my matrix [648x2400 double] into integers value to use a mRMR function, but I do not know how to do that. I have tried to convert by uint8(matrix) or int8(matrix) but it does not give integers... And I always have this note: "Undefined function 'mrmr_mid_d' for input arguments of type 'int8' " (or double, or uint, and so on) can someone help me? thank you

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Wayne King
Wayne King 2013-12-5
编辑：Wayne King 2013-12-5
I'm not sure what you are saying. Do you mean that:
X = 10+randn(16,16);
X = uint8(X);
Does not result in integers for the output in X?
The error message you report ("Undefined function 'mrmr_mid_d' for input arguments of type 'int8' ") just sounds like MATLAB cannot recognize the function, mrmr_mid_d.m.
You need to add the folder containing that function to the MATLAB path. You can launch
>>pathtool
to add that folder.
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Emilie Mussard
Emilie Mussard 2013-12-5
Thank you, I hadn't thought of the path problem and I focused on a wrong problem!

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更多回答（3 个）

Kelly Kearney
Kelly Kearney 2013-12-5
It's possible that mrmr_mid_d.m isn't on your path; the other possibility is that it doesn't actually accept integer data types as input, but integer values stored as double arrays. In this case, you need to round your data in some manner (see round, ceil, floor, fix, etc)
x = rand(10)*10;
x = round(x);
mrmr_mid_d(x); % or whatever the syntax is...
MathWorks Support Team
To convert an array of type “double” to an integer type, you can use a function such as “int64”, which converts the input to a 64-bit integer. For example, consider the following:
x_double = [1 2 3];
x_int = int64(x)
For more information on integer types and functions, see https://www.mathworks.com/help/matlab/matlab_prog/integers.html
  1 个评论
Macro
Macro 2024-1-2
Thank you for sharing. Great information! Converting a double array to an integer type is a common task in programming, and using the "int64" function for a 64-bit integer conversion is a smart approach. Your example is helpful for me.

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sixwwwwww
sixwwwwww 2013-12-5
you can do it as follow:
a = randi(100, 4);
a = int64(a);
see following link for more information about integer data types:
http://www.mathworks.com/help/matlab/numeric-types.html
  2 个评论
Emilie Mussard
Emilie Mussard 2013-12-5
Yes, it is what I have made. I thought that int64 (or int32, ...) was not the same type as int and so my function was not running on it, apparently I misunderstood and the problem is maybe in another place... Thank you for your prompt answer anyway!
Munawara Munia
Munawara Munia 2016-4-26
Hi Emilie, I am facing the same problem. I ama also trying to use mRMR and getting the same errors. Could you kindly tell me what was the issues with your code and how you solved it..?? Badly need a solution about it. Thanks in advance. :)

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