how do I print a txt file of integers and floats?

조회 수: 179(최근 30일)
I have tried in vain to write a text file of a mix of ints and floats. Suppose I have A = nx1 ints, and B = nx1 floats I want the file to end up like this: [A B], i.e. just two columns, first column the ints, second column the floats
1 3.232
2 4.333
...
100 5.444
I have tried
dlmwrite(filename,[A B]) and the result is
[A int(B)] === Not what I want
id =fopen(filename)
fprintf(id,'%d %f \n',A,B)
fclose(id);
Result is
A
B
also not what I want How do I get the right format?

채택된 답변

Walter Roberson
Walter Roberson 2016년 10월 4일
This cannot be done with dlmwrite()
If your integer values are small enough to fit within double then you can use
data = [A(:), B(:)] .'; %notice the transpose
fprintf(id, '%d %f\n', data);
If your integer values are small enough to fit within int64 (signed) then you can use
t1 = num2cell(A(:));
t2 = num2cell(B(:));
data = [t1, t2] .'; %notice the transpose
fprintf(id, '%d %f\n', data{:}); %expand the cell. Each argument will have its own data type so the int64 will not get truncated to double
If your integer values are uint64 (unsigned) and might not fit in int64 (signed) then proceed like above with the cells, but use %u instead of %d
  댓글 수: 4
Walter Roberson
Walter Roberson 2016년 10월 4일
This approach works even when some of the variables to be output are cell array of character (what used to be known as strings.)

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추가 답변(4개)

Joe Yeh
Joe Yeh 2016년 10월 4일
Well, you'll have to print it line by line:
for ii = 1:n
fprintf(fid, '%d %f \n', A(ii), B(ii));
end
  댓글 수: 1
John Petersen
John Petersen 2016년 10월 4일
is there really no way to vectorize this?

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Guillaume
Guillaume 2016년 10월 4일
I suspect that your dlmwrite call didn't work as expected because A is some integer class, so B gets converted to integer when you concatenate it with A.
Try:
dlmwrite(filename, [double(A) B])
  댓글 수: 2
Walter Roberson
Walter Roberson 2016년 10월 5일
dlmwrite() allows you to change the output format using the 'Precision' option, but only one format can be specified; you cannot specify different formats for different columns.

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John Petersen
John Petersen 2016년 10월 4일
Thank you for your input and suggestions! I have finally come up with this
Ad = double(A); % cast the int to a double
data = [Ad B]';
fprintf(id,'%6.0f %f\n',data); % but truncate it so it LOOKS like an int
which appears in the file like ints and floats in two columns as I wanted.

Dheeraj Maurya
Dheeraj Maurya 2022년 5월 23일
what is the type =is integer(un)
  댓글 수: 1
Walter Roberson
Walter Roberson 2022년 5월 24일
I am not clear on what you are asking? If you are asking about the return type from the isinteger() call, then the answer would be "logical"

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