MATLAB: Skipping lines in text file

loading text fileskipping linestext file

Hello, I have a text file called Acc that has two columns of data. The first has text and i want it to skipped. Can anyone help me solve it. I am a new user.

Here is how I load the data;

load 'Acc.txt';
time = Acc(:,1); 
Acc_x = Acc(:,2);

Thank you

Muhsin

Best Answer

Most likely, you could read the file very simply with:

t = readtable('Acc.txt');

which, if the first line is a header, should parse the header correctly and name the columns correctly. if that doesn't work you can always tell readtable to skip the first line:

t = readtable('Acc.txt', 'HeaderLines', 1);

Note that reading a file as a table is much better than popping variables with unpredictable names in your workspace.

Related Solutions

MATLAB: Write a simple txt files made by strings and numbers

With minimal changes to what you have (change space to tab too)

tests = vertcat('CT4H12X9','CT5H12X9','CT5H12X8','CT6H12X7','CT7H12X2','CT8H12X2','CT7H12X5','CT8H12X6');
% y_acc_max=[CT4H12X9_max_acc,CT5H12X9_max_acc,CT5H12X8_max_acc,CT6H12X7_max_acc,CT7H12X2_max_acc,CT8H12X2_max_acc,CT7H12X5_max_acc,CT8H12X6_max_acc];

y_acc_max = rand(1,8);
% A = [tests; y_acc_max];
fileID = fopen('acc_max.txt','w');
fprintf(fileID,'%8s\t%12s\r\n','Test','Maximum acceleration');
for irow = 1:length(y_acc_max)
	fprintf(fileID,'%8s\t%12.8f\r\n',tests(irow,:),y_acc_max(irow));
end
fclose(fileID);

Another option with minimal change

tests = {'CT4H12X9','CT5H12X9','CT5H12X8','CT6H12X7','CT7H12X2','CT8H12X2','CT7H12X5','CT8H12X6'};
% y_acc_max=[CT4H12X9_max_acc,CT5H12X9_max_acc,CT5H12X8_max_acc,CT6H12X7_max_acc,CT7H12X2_max_acc,CT8H12X2_max_acc,CT7H12X5_max_acc,CT8H12X6_max_acc];
y_acc_max = rand(1,8);
A = [tests; num2cell(y_acc_max)]
fileID = fopen('acc_max_2.txt','w');
fprintf(fileID,'%8s\t%12s\r\n','Test','Maximum acceleration');
fprintf(fileID,'%8s\t%12.8f\r\n',A{:});
fclose(fileID);

Maybe also look into "table" variable type. With the second example

t = table(y_acc_max','VariableNames',{'Maximum acceleration'},'RowNames',tests)
t.Properties.DimensionNames{1} = 'Test'
writetable(t,'acc_max_t.txt','WriteRowNames',true,'Delimiter','\t')

MATLAB: Smallest of 3 arrays

L = min([length(Acc_X), length(Acc_Y), length(Acc_Z)]);
Acc_X = Acc_X(1:L);
Acc_Y = Acc_Y(1:L);
Acc_Z = Acc_Z(1:L);

Best Answer

Related Solutions

MATLAB: Write a simple txt files made by strings and numbers

MATLAB: Smallest of 3 arrays

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