distributionFitter: Lognormal distribution

2023 2 9
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更新时间：2023 2 13
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Hi
I wanted to fit my Data to the lognormal distribution, but I get this error message : "The data in X must be positive".
I am pretty sure that the data and the frequency arrays are positive (>=0).
How can I ovecome this issue.

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Torsten
Torsten 2023-2-9
编辑：Torsten 2023-2-9
Maybe there are NaN, Inf or -Inf values in your data vector ?
What does
any(Data(1,:) < 0)
return ?
Check it. We cannot because you didn't include the data.
Mohamed Zied
Mohamed Zied 2023-2-9
>> any(Data(1,:) < 0)
ans =
logical
0
I did, none of the values is negative. Actually, Data represents the bin edges. So logically, it can be negative. This error pops up only with Lognormal distribution.
Torsten
Torsten 2023-2-9
编辑：Torsten 2023-2-9
So you don't use the Data(1,:) directly to fit the lognormal distribution, but some preprocessed data that you don't know exactly ?
What about
any(Data(1,:) <= 0)
?
Mohamed Zied
Mohamed Zied 2023-2-13
Yes, I found some zeros.
I have to remove these values to be able to fitt my data to the Lognormal distribution.
Thank you for your help
Mohamed Zied
Mohamed Zied 2023-2-13
I predefined the bin edges. for some bins the count is 0. Thus, the error.

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Steven Lord
Steven Lord 2023-2-9

1 个投票

I am pretty sure that the data and the frequency arrays are positive (>=0).
0 is not positive. What does this command show?
any(Data(1, :) == 0)

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Mohamed Zied
Mohamed Zied 2023-2-13
You are right. There are some zeros in my Data. I have to remove these values to be able to fitt my data to the Lognormal distribution.
Thank you for your help

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