Write a simple txt files made by strings and numbers

Question

Guglielmo Giambartolomei 2019-10-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484404-write-a-simple-txt-files-made-by-strings-and-numbers

评论： Guglielmo Giambartolomei 2019-10-10

Good evening,

I would like to write a simple .txt file with data I already have in my workspace. In particular I would like to create a 9x2 matrix with strings and numerical values. The code I wrote is the following. I think there are some problems with the %.... Thank you for your help.

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];
A = [tests; y_acc_max];
fileID = fopen('acc_max.txt','w');
fprintf(fileID,'%6s %12s\n','Test','Maximum acceleration');
fprintf(fileID,'%6.2s %12.8f\r\n',A);
fclose(fileID);

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J. Alex Lee 2019-10-10

在 MATLAB Online 中打开

Where is your issue/error? Assuming y_acc_max is a 1x8 double, I would think you have an error trying to concatenate your char array and double array

A = [tests; y_acc_max];

Also, what happens to your code when your labels (tests) have different number of characters?

Adam Danz 2019-10-10

" In particular I would like to create a 9x2 matrix with strings and numerical values. "

"A is the matrix 9x2 that I would like to create. The first row is the title ..."

What you are describing is not a "matrix". Matrices are only numeric. You're probably working with a cell array or a table.

This is why I asked if you could provide us with "A" or at least a few rows of A so we can see what you're doing.

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Answer 1

J. Alex Lee 2019-10-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484404-write-a-simple-txt-files-made-by-strings-and-numbers#answer_395683

在 MATLAB Online 中打开

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')