# 'Value' must be double scalar within the range of 'Limits'

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Lola 2022년 6월 16일
댓글: Adam Danz 2022년 6월 16일
Hi. I am creating a gui on appdesigner. I am reading numeric data from a csv file and storing this data in an array. I want to calculate the standard deviation of the values store in the array and display it on the numeric edit field. The error I get is 'Value' must be a double scalar within the range of 'Limits'. But my Limit of the editfield is -Inf,Inf. The csv file is attached and the code is provided below. Please assist.
col_vec=data{:,2}
app.stdEditField.Value=std(col_vec);
I tried editing the code to :
app.stdEditField.Value=std(single(col_vec))
Or
app.stdEditField.Value=std(double(col_vec))
But the error still pops up.
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Lola 2022년 6월 16일
Hi. I have attached the csv file that has the results in it. It is column 2. I'm reading the values after 9 rows

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### 채택된 답변

편집: Adam Danz 2022년 6월 16일
Your data contains a NaN value.
col_vec=data{:,2};
n = sum(isnan(col_vec));
fprintf('There are %d NaN values in col_vec\n', n)
There are 1 NaN values in col_vec
std(col_vec)
ans = NaN
Where is the NaN value?
nanLoc = find(isnan(col_vec));
fprintf('NaN in row %d', nanLoc)
NaN in row 789
When there is at least 1 NaN in a vector, std will return NaN.
Options:
1. Figure out why there are NaNs and replace them (manually, smoothing, interpolation, etc)
2. Ignore the NaNs: S = std(___,nanflag)
sd = std(col_vec,'omitnan')
sd = 37.5436
🤜🤛

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