Combine writematrix with a text header and safe as file

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Simon Keegan
Simon Keegan 2021-1-4
编辑： Walter Roberson 2022-8-23
Hi guys,
I am stuck with this problem since many hours. I want have multible *.IV0 files (with headers). I attached one example AS A *.TXT! It was npt possible to upload *.IV0 files. So please rename it when you try to solve this problem. The fact that it is a *.IV0 file changes many things. Since with this filetype it is not possible to use some matlab codes.
I try to average all files in a specifc folder excluding the header (first 27 rows). This works great so far. Afterwards I wanted to save the averaged data by using writematrix. This works too by using following code:
folder = 'C:\Users\--__aver\';
IV0Files = dir(fullfile(folder, '*.IV0')); % Use absolute path names
numfiles = length(IV0Files);
data_sum = 0;
rows = [1,2,3,4];
for ci = 1:numfiles
data_file = readmatrix(IV0Files(ci).name,"NumHeaderLines",27,"FileType","text");
data_sum = data_sum+data_file(:,rows); % summation accross the files (removed 3rd column (time))
end
% divide by numfiles to have the average (and not the sum)
average = data_sum/numfiles;
averagecell=num2cell(average);
%this is to save the data in the new IV0 file
writematrix(average, fullfile(folder,'otherdirectionSK-ITOLspray16.IV0'),"Delimiter","tab", "FileType", "text");
But now comes the heavy part. I tried to add a header to my output file. The header should be the same as in one of the files I average. So basically the first 27 rows of the attached file. I tried soo much and I can´t figure out a way to do it. Since it is a *.IV0 file things get even more complicated. I have tried things using:
opts (does not work for *.IV0)
fgets (in a for loop (same as code above), got stuck, I think because of the tab delimiter maybe...)
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Simon Keegan
Simon Keegan 2021-1-4
Hi dpb,
Thanks for the quick answer. I tried to store the data in a temporary file to, but i did not find a way to bring the two files (header + matrix) back together... Maybe you have a good code for that.
This was the code I tried:
fileID = fopen(IV0Files(ci).name,'r');
formatSpec = '%c';
pease = {fscanf(fileID,formatSpec)};
fclose(fileID);
This works quit well, since the output 'pease' is a 1*1cell and looks like this
'#Filename Simon_R
#Sample 1
#Cell 1
#Pixel R
#group 2
#description SK-Cspray
#ActiveArea 0.133 cm2
#LI 0 mW/cm2
#Type darkIV
#Geometry inverted
#IlluminationDirection front
#ScanDirection backward
#Delay 0.01 s
#Integrationrate 1
#Repetition 1
#LightSoaking 0 s
#VoltageStabilization 5 s
#Atmosphere N2
#Date 2020-12-04
#Time 12:35:31 s
#Filepath D:\data\IV\2020-12-04\
#JSC 0.012728 mA/cm2
#Rsh 3.028 Ohm/cm2
#Rs 0.001733 Ohm/cm2
V I J Time
V mA mA/cm2 s
-0.5 2.1549 16.2022 1546.35
-0.49 2.11718 15.9187 1546.42
-0.48 2.07964 15.6364 1546.49
-0.47 2.04002 15.3385 1546.56
-0.46 2.00048 15.0412 1546.63
-0.45 1.96221 14.7535 1546.7
-0.44 1.92393 14.4656 1546.78
-0.43 1.88449 14.1691 1546.84
-0.42 1.84523 13.8739 1546.92
-0.41 1.80576 13.5772 1546.98
-0.4 1.76632 13.2806 1547.06
-0.39 1.72795 12.9921 1547.13
-0.38 1.68799 12.6916 1547.19
-0.37 1.64906 12.399 1547.27
-0.36 1.60852 12.0941 1547.34
-0.35 1.56847 11.793 1547.41
-0.34 1.52787 11.4877 1547.48
-0.33 1.48748 11.1841 1547.55
-0.32 1.44739 10.8826 1547.63
-0.31 1.40835 10.5891 1547.7
-0.3 1.36908 10.2939 1547.77
-0.29 1.32607 9.97044 1547.85
-0.28 1.28513 9.66262 1547.91
-0.27 1.246 9.36846 1547.98
-0.26 1.20684 9.07398 1548.06
-0.25 1.16507 8.75991 1548.13
-0.24 1.12414 8.45222 1548.2
-0.23 1.08273 8.14084 1548.28
-0.22 1.04684 7.87098 1548.35
-0.21 1.00523 7.55814 1548.4
-0.2 0.965133 7.25664 1548.48
-0.19 0.921994 6.93229 1548.55
-0.18 0.879875 6.6156 1548.62
-0.17 0.836516 6.28959 1548.7
-0.16 0.795471 5.98098 1548.77
-0.15 0.751063 5.64709 1548.84
-0.14 0.706719 5.31367 1548.91
-0.13 0.663744 4.99056 1548.99
-0.12 0.618529 4.65059 1549.05
-0.11 0.572994 4.30822 1549.12
-0.1 0.52684 3.96121 1549.2
-0.09 0.479441 3.60482 1549.27
-0.08 0.431241 3.24242 1549.34
-0.07 0.383092 2.88039 1549.41
-0.06 0.332879 2.50285 1549.49
-0.05 0.281743 2.11837 1549.56
-0.04 0.229072 1.72234 1549.63
-0.03 0.175464 1.31928 1549.71
-0.02 0.119318 0.897129 1549.78
-0.01 0.0621344 0.467176 1549.85
0 0.00169287 0.0127283 1549.92
0.01 -0.0630867 -0.474336 1549.99
0.02 -0.131665 -0.989966 1550.06
0.03 -0.204532 -1.53784 1550.14
0.04 -0.280579 -2.10962 1550.21
0.05 -0.361421 -2.71745 1550.28
0.06 -0.447311 -3.36324 1550.36
0.07 -0.538849 -4.0515 1550.43
0.08 -0.63558 -4.7788 1550.5
0.09 -0.740072 -5.56445 1550.57
0.1 -0.850548 -6.3951 1550.65
0.11 -0.968678 -7.28329 1550.72
0.12 -1.10875 -8.33647 1550.79
0.13 -1.24648 -9.37202 1550.87
0.14 -1.39516 -10.49 1550.94
0.15 -1.56075 -11.735 1551.01
0.16 -1.73215 -13.0236 1551.09
0.17 -1.91328 -14.3856 1551.23
0.18 -2.10811 -15.8505 1551.31
0.19 -2.31273 -17.389 1551.38
0.2 -2.52926 -19.017 1551.45
0.21 -2.75875 -20.7425 1551.53
0.22 -2.99947 -22.5524 1551.6
0.23 -3.25212 -24.452 1551.66
0.24 -3.52486 -26.5027 1551.73
0.25 -3.80248 -28.5901 1551.81
0.26 -4.10054 -30.8311 1551.88
0.27 -4.40517 -33.1216 1551.95
0.28 -4.73676 -35.6147 1552.03
0.29 -5.06977 -38.1186 1552.1
0.3 -5.4176 -40.7338 1552.17
0.31 -5.77922 -43.4528 1552.24
0.32 -6.14209 -46.1812 1552.32
0.33 -6.52297 -49.0449 1552.39
0.34 -6.91095 -51.962 1552.46
0.35 -7.32006 -55.038 1552.54
0.36 -7.734 -58.1504 1552.61
0.37 -8.16401 -61.3835 1552.68
0.38 -8.60084 -64.6679 1552.75
0.39 -9.0378 -67.9534 1552.83
0.4 -9.52041 -71.582 1552.9
0.41 -9.99943 -75.1837 1552.97
0.42 -10.4854 -78.8375 1553.04
0.43 -10.9657 -82.4486 1553.12
0.44 -11.4615 -86.1769 1553.19
0.45 -11.9704 -90.0033 1553.26
0.46 -12.4891 -93.9031 1553.34
0.47 -13.024 -97.9251 1553.41
0.48 -13.555 -101.918 1553.47
0.49 -14.1044 -106.048 1553.54
0.5 -14.6541 -110.182 1553.62
0.51 -15.2197 -114.434 1553.69
0.52 -15.7724 -118.589 1553.76
0.53 -16.3615 -123.019 1553.84
0.54 -16.945 -127.406 1553.91
0.55 -17.5292 -131.799 1553.98
0.56 -18.1306 -136.32 1554.06
0.57 -18.7288 -140.818 1554.13
0.58 -19.3304 -145.342 1554.2
0.59 -20.0293 -150.596 1554.27
0.6 -20.6564 -155.312 1554.35
0.61 -21.2736 -159.952 1554.4
0.62 -21.9023 -164.679 1554.48
0.63 -22.5602 -169.626 1554.55
0.64 -23.1887 -174.351 1554.7
0.65 -23.8945 -179.658 1554.77
0.66 -24.5594 -184.657 1554.85
0.67 -25.2029 -189.496 1554.92
0.68 -25.8751 -194.55 1554.99
0.69 -26.5599 -199.699 1555.06
0.7 -27.2318 -204.75 1555.14
0.71 -27.9294 -209.995 1555.21
0.72 -28.6116 -215.125 1555.28
0.73 -29.3129 -220.398 1555.34
0.74 -30.015 -225.677 1555.49
0.75 -30.7045 -230.861 1555.64
0.76 -31.423 -236.264 1555.87
0.77 -32.1582 -241.791 1556.1
0.78 -32.879 -247.211 1556.17
0.79 -33.5899 -252.556 1556.23
0.8 -34.319 -258.038 1556.31
0.81 -35.0479 -263.518 1556.38
0.82 -35.7709 -268.954 1556.45
0.83 -36.4986 -274.426 1556.53
0.84 -37.2321 -279.94 1556.6
0.85 -37.9626 -285.433 1556.67
0.86 -38.7156 -291.095 1556.74
0.87 -39.4725 -296.786 1556.82
0.88 -40.2235 -302.432 1556.89
0.89 -40.9935 -308.222 1556.96
0.9 -41.7451 -313.873 1557.04
0.91 -42.5085 -319.613 1557.11
0.92 -43.2488 -325.179 1557.18
0.93 -44.0205 -330.981 1557.25
0.94 -44.8033 -336.867 1557.32
0.95 -45.542 -342.421 1557.4
0.96 -46.3169 -348.247 1557.47
0.97 -47.083 -354.008 1557.54
0.98 -47.8437 -359.727 1557.77
0.99 -48.64 -365.714 1557.84
1 -49.4225 -371.598 1557.91
1.01 -50.194 -377.399 1557.98
1.02 -50.9628 -383.179 1558.06
1.03 -51.7674 -389.228 1558.13
1.04 -52.5371 -395.016 1558.2
1.05 -53.344 -401.083 1558.27
1.06 -54.1276 -406.975 1558.35
1.07 -54.9069 -412.834 1558.42
1.08 -55.6912 -418.731 1558.49
1.09 -56.4796 -424.658 1558.57
1.1 -57.2606 -430.531 1558.64
1.11 -58.0643 -436.574 1558.71
1.12 -58.8262 -442.302 1558.78
1.13 -59.63 -448.346 1558.86
1.14 -60.408 -454.195 1558.93
1.15 -61.1747 -459.96 1558.99
1.16 -61.9803 -466.018 1559.06
1.17 -62.7198 -471.578 1559.14
1.18 -63.4747 -477.253 1559.21
1.19 -64.2381 -482.994 1559.28
1.2 -65.0449 -489.059 1559.36
1.21 -65.8053 -494.777 1559.43
1.22 -66.5218 -500.164 1559.5
1.23 -67.2503 -505.642 1559.58
1.24 -67.9354 -510.792 1559.65
1.25 -68.6096 -515.862 1559.72
'
But I don´t know how I get just the header and not the whole thing and I don´t know how I put this thing above the 'writematrix' code.
Simon Keegan
Simon Keegan 2021-1-4
Sorry for the long code field...
I did change the program so many times that I couldn´t restore my version with 'fgets/fprintf'...Sorry for that too.

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采纳的回答

Mathieu NOE
Mathieu NOE 2021-1-4
hello simon
welcome back and happy new year !
I somehow recognize this code.... and now comes the upgraded version that appends the data to the headers
try this ( after adjusting the folder path) :
folder = cd;
% folder = 'C:\Users\--__aver\';
IV0Files = dir(fullfile(folder, '*.IV0')); % Use absolute path names
numfiles = length(IV0Files);
data_sum = 0;
rows = [1,2,3,4];
for ci = 1:numfiles
data_file = readmatrix(IV0Files(ci).name,"NumHeaderLines",27,"FileType","text");
data_sum = data_sum+data_file(:,rows); % summation accross the files (removed 3rd column (time))
end
% divide by numfiles to have the average (and not the sum)
average = data_sum/numfiles;
% averagecell=num2cell(average); % not needed as we use writematrix
% retrieve headers line (from first file)
lines= readlines(IV0Files(1).name);
header_lines = convertStringsToChars(lines(1:27,:));
%this is to save the data in the new IV0 file
writecell(header_lines, fullfile([folder '\out'],'otherdirectionSK-ITOLspray16.IV0'),"Delimiter","tab", "FileType", "text");
writematrix(average, fullfile([folder '\out'],'otherdirectionSK-ITOLspray16.IV0'),"Delimiter","tab", "FileType", "text","WriteMode","append");
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Mathieu NOE
Mathieu NOE 2021-1-4
you're welcome !!
pretty happy to start the new year on a good tempo ! at least that worked today !!

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更多回答（1 个）

Walter Roberson
Walter Roberson 2021-1-4
编辑：Walter Roberson 2022-8-23
  2 个评论
dpb
dpb 2021-1-4
Interesting new addition, Walter.
Which release introduced it? R2019b lacks it which is what have here...
Alan Hoskins
Alan Hoskins 2022-8-23
Yeah, 2019b lacks this functionality. I guess I need to upgrade.

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