Matlab coder giving issue with 'textscan'

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Gopika Akhil
Gopika Akhil 2018-12-28
评论： Stephen23 2019-1-1
I am trying Matlab Coder for the first time. I understood that it gives conversion of my Matlab code to C code.
My data input is from a .txt file and i used 'textscan' finction in my code which is giving issue in Matlab coder.
Can anybody suggest how can i fix this.
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Gopika Akhil
Gopika Akhil 2018-12-28
portion of the code giving error is
fid=fopen('101.txt');
s=textscan(fid,'%f'); -----> issue is "textscan is not supported for code generation"
fclose(fid);
x = s{1};
xsig =x(1:1:1000);
The text file used is also attached here . It is ECG signal.

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Stephen23
Stephen23 2018-12-28
编辑：Stephen23 2019-1-1
Basically you will have to read the data as characters, and then convert to numeric. Probably the easiest way to do this is to use fread and then the method I outlined here:
https://www.mathworks.com/matlabcentral/answers/416891-matlab-coder-str2num-alternatives
Your case is simpler because you only have one single vector of data, which simplifies things quite a bit (I have not tested this with Coder, but I am sure that you can tweak it as required):
fid = fopen('101.txt');
str = fread(fid,[1,Inf],'char');
fclose(fid);
str = char(str);
idx = isstrprop(str,'wspace');
idy = diff([true,idx,true]);
idb = find(idy<0);
ide = find(idy>0)-1;
num = numel(idb);
tmp = cell(num,1);
for k = 1:num
tmp{k} = str(idb(k):ide(k));
end
vec = str2double(tmp);
Giving:
>> numel(vec)
ans = 1200
>> vec
vec =
-0.34500
-0.34500
-0.34500
-0.34500
-0.34500
-0.34500
-0.34500
-0.34500
... lots of lines here
-0.40500
-0.41500
-0.42500
-0.42000
-0.42000
-0.42000
-0.43000
-0.43000
-0.43000
EDIT (no cell array):
fid = fopen('101.txt');
str = fread(fid);
fclose(fid);
str = char(str(:).');
idx = isstrprop(str,'wspace');
idy = diff([true,idx,true]);
idb = find(idy<0);
ide = find(idy>0)-1;
num = numel(idb);
out = nan(num,1);
for k = 1:num
out(k) = str2double(str(idb(k):ide(k)));
end
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Stephen23
Stephen23 2018-12-31
"coder prohibits t permission in fopen()"
It is not required anyway, so I got rid of that.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2018-12-28
MATLAB Coder does not support textscan(). It also does not support fgetl() or fgets() or fgetc() or fscanf() or sscanf() . It does support fread(), including reading one character at a time, so you could in theory write an equivalent to fscanf() .
... But in practice you would not do that. Instead, in practice what you would do is use coder.ceval() to call C standard I/O routines to analyze and convert lines.
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Gopika Akhil
Gopika Akhil 2019-1-1
Hi Stephen Cobeldick,
Can you suggest
1)what i have to use insted of 'inf' in your code, because coder will not take 'inf'
2)how will i convert each substring to numeric separately.because i am again getting inf when i tried it before making the cell.
Stephen23
Stephen23 2019-1-1
"what i have to use insted of 'inf' in your code, because coder will not take 'inf'"
See the "EDIT" code in my answer, which does not use Inf.
"how will i convert each substring to numeric separately.because i am again getting inf when i tried it before making the cell."
See the "EDIT" code in my answer, which does not use a cell array.

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