if else statement

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douglas
douglas 2012-4-11
I have a for loop that used to open text files for plotting, and I want to have an if else statement that will set headerlines equal to 5 for test files having less than 500 rows, and headerlines equal to 400 for those having in excess of 500 rows. I have this so far but it does not seem to be working;
for k = 58:212
inputFileName = sprintf('MT_%05i-000.txt',k);
outputFileName = sprintf('results%05i.tiff',k);
fid = fopen(inputFileName);
newcmd=sprintf('more %s|wc -l', inputFileName);
[p,num_lines]=system(newcmd);
if num_lines<=500
datacell = textscan(fid, '%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f','HeaderLines',5);
fclose(fid);
else
datacell = textscan(fid, '%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f','HeaderLines',500);
fclose(fid); %number of %f reflects number of columns to record from text file
end
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Thomas
Thomas 2012-4-11
can you give me a sample of your text file.?
douglas
douglas 2012-4-11
// Start Time: 0
// Sample rate: 10.0Hz
// Scenario: 1.8
// Firmware Version: 2.5.1
Year Month Day Second Temperature Acc_X Acc_Y Acc_Z Gyr_X Gyr_Y Gyr_Z Mag_X Mag_Y Mag_Z Roll Pitch Yaw AnalogIn_1 AnalogIn_2 Latitude Longitude Altitude Vel_X Vel_Y Vel_Z Status
0 0 0 0.0083 17.13 -3.602011 -0.023927 9.130322 0.002424 -0.003330 0.005214 0.551597 0.036565 -0.615183 -0.150150 21.529704 -6.936187 0 0 0.000000000 0.000000000 0.000000 0.000000 0.000000 0.000000 1
0 0 0 0.1083 17.13 -3.616401 -0.028699 9.101781 -0.013352 0.002609 -0.002676 0.546472 0.050605 -0.614217 -0.232993 21.544571 -6.953156 0 0 -0.000000001 0.000000000 -0.000094 -0.002426 -0.000193 -0.001876 1
0 0 0 0.2083 17.13 -3.626294 -0.006795 9.111114 0.005820 0.006014 0.006351 0.548270 0.048896 -0.615307 -0.185587 21.579128 -6.914592 0 0 -0.000000004 -0.000000001 -0.000314 -0.004752 0.003139 -0.002529 1
0 0 0 0.3083 17.13 -3.599662 -0.019086 9.139808 -0.003034 -0.001575 -0.005997 0.548736 0.048293 -0.615885 -0.216817 21.569953 -6.951937 0 0 -0.000000008 -0.000000004 -0.000515 -0.003222 0.004013 -0.001485 1
0 0 0 0.4083 17.13 -3.601782 -0.028687 9.101578 -0.001878 0.001172 -0.003753 0.542780 0.044977 -0.605897 -0.236359 21.576554 -6.975514 0 0 -0.000000011 -0.000000008 -0.000785 -0.003494 0.004624 -0.003916 1
0 0 0 0.5083 17.13 -3.592106 -0.028719 9.111055 -0.001411 0.002545 -0.002635 0.548381 0.045602 -0.610085 -0.250711 21.591040 -6.992247 0 0 -0.000000014 -0.000000013 -0.001272 -0.002378 0.005380 -0.005822 1
0 0 0 0.6083 17.13 -3.592194 -0.023880 9.120574 -0.012431 0.002142 -0.002905 0.545978 0.050608 -0.614250 -0.328819 21.603194 -7.010641 0 0 -0.000000015 -0.000000018 -0.001905 -0.000590 0.006776 -0.006842 1
0 0 0 0.7083 17.13 -3.631372 -0.019131 9.145054 -0.000406 0.001911 0.002302 0.547899 0.049894 -0.615344 -0.326204 21.614191 -6.996948 0 0 -0.000000016 -0.000000026 -0.002455 -0.001107 0.010194 -0.004149 1
0 0 0 0.8083 17.13 -3.601852 -0.028727 9.111190

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采纳的回答

Thomas
Thomas 2012-4-11
You could try
for k = 58:212
inputFileName = sprintf('MT_%05i-000.txt',k);
outputFileName = sprintf('results%05i.tiff',k);
fid = fopen(inputFileName);
datacell=textscan(fid,'%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f');
if length(datacell)<=500 % this depends on the structure of datacell
actual_data=datacell(5:end) % removing only the 5 headerlines
fclose(fid);
else
actual_data=datacell(401:end) % removing 400 headerlines data > 500 rows
fclose(fid);
end
end
use only the actual_data for computation
EDIT: Try the following
for k = 58:212
inputFileName = sprintf('MT_%05i-000.txt',k);
outputFileName = sprintf('results%05i.tiff',k);
fid = fopen(inputFileName);
c=textscan(fid,'%f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f','Headerlines',5,'delimiter',' ');
if length(c{1,1})<500 % this tell us there are less than 500 elements
datacell=textscan(fid,'%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f','Headerlines',5,'delimiter',' ');
fclose(fid);
else
datacell=textscan(fid,'%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f','Headerlines',400,'delimiter',' ');
fclose(fid);
end
end
  9 个评论
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douglas
douglas 2012-4-11
It seems to have fixed the problem!
Thank you so much for you help, you have been tremendous in assisting me!
Thomas
Thomas 2012-4-11
You are welcome.. Please accept the other answer as well since, it might help someone on a linux system..

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