How do I use fprintf to show the entire array in one ouput statement

Question

Josua Mensah 2017-4-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333890-how-do-i-use-fprintf-to-show-the-entire-array-in-one-ouput-statement

评论： Tunc Durmaz 2019-6-1

采纳的回答： Jan

在 MATLAB Online 中打开

>>

A = [-4 2 -7 6 8; 4 -5 8 -1 0; 0 -4 3 1 10; -8 7 -10 5 -2];

[rows cols] = size(A);

Z = zeros(size(A));

for x = 1:1:rows

    for y = 1:1:cols
        if A(x,y) <= 4
            Z(x,y) = A(x,y);
        end
    end
end

fprintf('%i\n',Z);

My ouput statement I am getting is

Instead of

                         -4   2 -7   0  0
                          4  -5  0  -1  0   
                          0  -4  3   1  0
                         -8   0 -10  0 -2

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Answer 1

Jan 2017-4-5

5
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333890-how-do-i-use-fprintf-to-show-the-entire-array-in-one-ouput-statement#answer_261925

编辑：Jan 2017-4-5

在 MATLAB Online 中打开

fprintf('%i %i %i %i %i\n', Z.');

or:

fprintf('%4i %4i %4i %4i %4i\n', Z.');

Note that the matrix must be transposed, because the elements are store columnwise, but the display is written in rowwise order.

By the way: It is easier without loops:

Z        = zeros(size(A));
index    = (A <= 4);
Z(index) = A(index);

Or:

Z        = A;
Z(Z > 4) = 0;

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Josua Mensah 2017-4-6

Thanks man. Was not even aware of the other ways to go about it.

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Answer 2

Jay Stanley 2019-6-1

4
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333890-how-do-i-use-fprintf-to-show-the-entire-array-in-one-ouput-statement#answer_377450

在 MATLAB Online 中打开

Tunc Durmaz,

If you do not know the dimension of your array you can get its size and replicate a template based on those dimensions

Here's a minimum working example

matrix = magic(4) % example matrix
[mrows, ncols] = size(matrix)
outputstr = ['%' num2str(mrows) 'i '] % template for the string, you put your datatype here
outputstr = repmat(outputstr, 1, ncols) % replicate it to match the number of columns
outputstr = [outputstr '\n'] % add a new line if you want
fprintf(outputstr, matrix.') % write it

For completeness sake there is another trivial solution that does not use repmat via the loop

matrix = magic(4) % example matrix
[mrows, ncols] = size(matrix)
outputstr = ['%' num2str(mrows) 'i ']
template = ['%' num2str(mrows) 'i '] % template for the string, you put your datatype here
outputstr = template
for i = 2:mcols
    outputstr = [outputstr template]
end
outputstr = [outputstr '\n'] % add a new line if you want
fprintf(outputstr, matrix.') % write it