Find a specific char in a cell and turn it into NaN
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Hi,
i need to plot some temperature data from a csv excel data. If the Sensors werent active, the value at this time says Error 4 or Error 6. Matlab cant really plot those values and my first attempt was to turn those values into NaN. But i cant really find anything to do this. I should mention, that im new to matlab and dont know more than the basics.
Thank you in advance!
2 Kommentare
Stephen23
am 15 Mär. 2021
@Tobias Pfeifer: please upload a sample file by clicking the paperclip button.
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DGM
am 16 Mär. 2021
Bearbeitet: DGM
am 16 Mär. 2021
Let's say you have your sensor value as a cell vector -- but it's full of non-numeric garbage:
rawsensval={'3','5','Error 9000','53','24','Another Error','4345'};
sensvalnumeric=cell2mat(cellfun(@(s) {str2double(s)}, rawsensval))
Here, str2double() converts any non-numeric entries to NaN, giving you a simple numeric vector.
This is what I use in my own log processing scripts. There may be more elegant methods.
0 Kommentare
Stephen23
am 16 Mär. 2021
Bearbeitet: Stephen23
am 16 Mär. 2021
F = 'UmgebungsmessungDez.csv';
S = detectImportOptions(F, 'Delimiter',';', 'VariableNamingRule','preserve');
X = false(1,numel(S.VariableOptions));
X(4:end) = true; % specify which columns should be numeric
S = setvaropts(S, X, 'Type','double', 'DecimalSeparator',',');
S = setvaropts(S,'DATE', 'Type','datetime', 'InputFormat','dd.MM.yyyy');
T = readtable(F,S)
T(2110:2119,:) % the first few rows with number data
2 Kommentare
Stephen23
am 16 Mär. 2021
@Tobias Pfeifer: please remember to accept the answer that helped you most! Accepting and voting for answers is the easiest way you can show your appreciation to the volunteers on this forum.
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