error message 'char'.how to solve?
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function [EPClist,data]=extraction_data(Nomfichier)
dummy=importfile(Nomfichier);
j=1;
for i=1:height(dummy)
if dummy.OperationResult(i)==' Read OK'
data_raw(j,1)=dummy.Date(i);
data_raw(j,2)=dummy.EPC(i);
data_raw(j,3)=dummy.ReadData(i);
j=j+1;
end
end
clear dummy
EPClist=unique(data_raw(:,2));
Nb_capteur=length(EPClist);
data=cell(1,Nb_capteur);
for i=1:Nb_capteur
k=1;
for j=1:length(data_raw)
if data_raw(j,2)==EPClist(i)
%data{i}(k,1)=data_raw(j,1);
%data{i}(k,1)=0;
data{i}(k,1)=hex2dec(data_raw{j,3}(5:8));
temphexa=data_raw{j,3}(9:12);
if temphexa(1)=='F'
data{i}(k,2)=1/100*(hex2dec(temphexa)-hex2dec('FFFF')+1);
else
data{i}(k,2)=1/100*hex2dec(temphexa);
end
k=k+1;
end
end
EPClist{i}=EPClist{i}(end-3:end);
end
Error message:
Undefined function 'importfile' for input arguments of type 'char'.
Error in extraction_data (line 3)
dummy=importfile(Nomfichier);
Error in detect_palier (line 3)
[EPC,B]=extraction_data(titre);
Error in extract_palier (line 23)
[EPC,pression,temperature]=detect_palier(titre,table_delete);
1 个评论
Luca Ferro
2023-4-19
importfile is not a matlab built-in function, could you share its code or where you have taken it from?
回答（1 个）
Walter Roberson
2023-4-19
0 个投票
The function importdata has an option to generate a function that will import other files using the same configuration. It is common for the generated function to be called importfile . But it is not part of MATLAB; it is the result of someone using importdata() and asking to save the associated code.
These days, looking at the imported data, you should probably instead use readtable
6 个评论
md sazzad
2023-4-24
Walter Roberson
2023-4-24
Your existing for i=1:height(dummy) loop would be fine if you were to use readtable, with the exception that you should change the test to
if dummy.OperationResult(i)==" Read OK"
Walter Roberson
2023-4-24
Rewriting to use readtable:
function [EPClist,data]=extraction_data(Nomfichier)
dummy = readtable(Nomfichier);
j=1;
for i=1:height(dummy)
if strtrim(dummy.OperationResult(i)) == "Read OK"
data_raw(j,1)=dummy.Date(i);
data_raw(j,2)=dummy.EPC(i);
data_raw(j,3)=dummy.ReadData(i);
j=j+1;
end
end
clear dummy
EPClist=unique(data_raw(:,2));
Nb_capteur=length(EPClist);
data=cell(1,Nb_capteur);
for i=1:Nb_capteur
k=1;
for j=1:length(data_raw)
if data_raw(j,2)==EPClist(i)
%data{i}(k,1)=data_raw(j,1);
%data{i}(k,1)=0;
data{i}(k,1)=hex2dec(data_raw{j,3}(5:8));
temphexa=data_raw{j,3}(9:12);
if temphexa(1)=='F'
data{i}(k,2)=1/100*(hex2dec(temphexa)-hex2dec('FFFF')+1);
else
data{i}(k,2)=1/100*hex2dec(temphexa);
end
k=k+1;
end
end
EPClist{i}=EPClist{i}(end-3:end);
end
This has three differences compared to your original:
- changed importfile() to readtable()
- changed ' Read OK' to "Read OK"
- added strtrim()
I wanted to account for the possibility that when you used readtable() that possibly the leading space in ' Read OK' might not be present. Either way, whether it is or is not present, this code should work.
There is one potential problem, though: with readtable() the Date might be read as a datetime object rather than as numeric; if so then you would not be able to mix it in with numeric objects. But possibly it will come across as a char vector or as a cell array of char vectors or as a string... it would be easier if we had an extract of a file to test with.
md sazzad
2023-4-25
md sazzad
2023-4-25
Walter Roberson
2023-4-25
You have to pass in a file name.
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2023-4-25
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