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Remove trailing zeros while making matrix

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armin m
armin m on 31 Aug 2021
Commented: armin m on 31 Aug 2021
Hi. I have two matrices for example a=[1,2;3,4] and b=[5+6i,6+7i] i made C=[A,B]. but result shows [1.0000 2.0000 5.0000+6.0000i] and the second row like this format too. I wanna delete trailling zeros and make matrix like [1 2 5+6i]. Thank You.

Accepted Answer

Adam Danz
Adam Danz on 31 Aug 2021
Edited: Adam Danz on 31 Aug 2021
When combining real and compex numbers within a single array, the array will appear in compex format. Here are some ways to format real and complex numbers.
If you're using R2021a or later, you can use the formattedDisplayText function to capture the display output as a string (documentation) and write that to file rather than using diary.
Set format
You can set the display format to remove trailing zeros but the command window display will remain in complex format. If you're writing these variables to file or to a user interface component such as a text box, that's a different story. See sprintf() and fprintf() and let us know if you have any followup questions.
format shortg
a = [1; 2; 3];
b = [5+6i; 6+7i; 7+8i];
c = [a,b]
c =
1 + 0i 5 + 6i 2 + 0i 6 + 7i 3 + 0i 7 + 8i
format long
disp(c)
1.000000000000000 + 0.000000000000000i 5.000000000000000 + 6.000000000000000i 2.000000000000000 + 0.000000000000000i 6.000000000000000 + 7.000000000000000i 3.000000000000000 + 0.000000000000000i 7.000000000000000 + 8.000000000000000i
Use compose to specify formating of real and imaginary components
To print a line of text that formats real and complex values individually,
format shortg % not needed for the string conversion
a = [1, 2, 3];
b = [5+6i, 6+7i, 7+8i];
c = [a;b]
c =
1 + 0i 2 + 0i 3 + 0i 5 + 6i 6 + 7i 7 + 8i
% Convert all values to complex strings
complexStr = compose('%g%+gi', real(c(:)), imag(c(:)))
complexStr = 6×1 cell array
{'1+0i'} {'5+6i'} {'2+0i'} {'6+7i'} {'3+0i'} {'7+8i'}
% Convert the real value strings
isReal = imag(c(:))==0;
complexStr(isReal) = compose('%g', real(c(isReal)))
complexStr = 6×1 cell array
{'1' } {'5+6i'} {'2' } {'6+7i'} {'3' } {'7+8i'}
% Join all strings into 1
str = strjoin(complexStr', ', ')
str = '1, 5+6i, 2, 6+7i, 3, 7+8i'
% Or, display as cell array
cstr = reshape(complexStr, size(c))
cstr = 2×3 cell array
{'1' } {'2' } {'3' } {'5+6i'} {'6+7i'} {'7+8i'}
Isolate the real and complex values within cell arrays
a = [1; 2; 3];
b = [5+6i; 6+7i; 7+8i];
c = [a,a,b]
c =
1 + 0i 1 + 0i 5 + 6i 2 + 0i 2 + 0i 6 + 7i 3 + 0i 3 + 0i 7 + 8i
out = num2cell(c)
out = 3×3 cell array
{[1]} {[1]} {[5 + 6i]} {[2]} {[2]} {[6 + 7i]} {[3]} {[3]} {[7 + 8i]}
out = [mat2cell(c(:,1:2), ones(size(c,1),1),2), num2cell(c(:,3))]
out = 3×2 cell array
{[1 1]} {[5 + 6i]} {[2 2]} {[6 + 7i]} {[3 3]} {[7 + 8i]}
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