Problem about proximity in matlab

2012 10 26
1 个回答
5 次查看（30 天）

0 个投票

Hi, all,
I defined an array like S=ones(N,x,'uint32'). And I give values to all of them. However I find out the maximum value is 65535 which is 2^16 not 2^32.
I tried 'uint64' but the limit is still 65535, why is that?
Thanks.

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Walter Roberson
Walter Roberson 2012-10-26
How are you assigning the values?
>> S = ones(1,1,'uint32')
S =
1
>> S(1) = 99999
S =
99999
>> S(1)
ans =
99999
>> class(S)
ans =
uint32
C Zeng
C Zeng 2012-10-26
Oh, it is weird here. Let me try again.
C Zeng
C Zeng 2012-10-26
Oh, when I use class, it is converted to uint16. I need to figure out why?
However I only define uint32 at the beginning. So what could be a reason for converting to uint16? I am confused.
Image Analyst
Image Analyst 2012-10-27
Calling class() causes no conversion. It must have got converted some other way.

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回答（1 个）

Image Analyst
Image Analyst 2012-10-26

0 个投票

Somewhere along the way, you must have converted it to uint16, perhaps without realizing that you did so.

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C Zeng
C Zeng 2012-10-26
编辑：C Zeng 2012-10-26
I use another value calculate from other function. But I did not convert it, traditionally if I do not convert what is the data type?
C Zeng
C Zeng 2012-10-26
Thanks, Walter. I think it somewhere convert to double, however, double is more than uint32, right? Does it matter?
C Zeng
C Zeng 2012-10-26
Now, I shut all programs off and restart it, seems that there is no such convert data type problems.

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C Zeng
C Zeng
2012-10-26

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