# Help displaying a formatted matrix to the command window

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Brenden Epps on 5 Jun 2012
Edited: Stephen23 on 10 Oct 2018
Hi all, this seems like a simple question, but sprintf(...) doesn't do the trick. Is there an EASY way to display a matrix in the command window with a specified number of digits of precision?
EXAMPLE:
>> x = rand(3,2) - 0.5
x =
-0.3810 -0.1596
-0.0016 0.0853
0.4597 -0.2762
>> format long >> x
x =
-0.381002318441623 -0.159614273333867
-0.001635948017857 0.085267750979777
0.459743958516081 -0.276188060508863
How do I show x with, say, 6 digits of precision (as in below)??
-0.381002 -0.159614
-0.001635 0.085267
0.459743 -0.276188
I'm sure one could write a code that figured out the size of x and then used sprintf to create the desired output. Does this code exist?

Brenden Epps on 6 Jun 2012
I have created a function called DISPN that answers this question.

Oleg Komarov on 5 Jun 2012
Please read more carefully the documentation of sprintf(), it DOES the trick:
sprintf('%.6f %.6f\n',rand(3,2))
Edited
Now, if you wanna make the number of columns adjust automatically, then:
A = randn(3,9);
sprintf([repmat('%10.6f',1,size(A,2)) '\n'],A)
Unfortunately, there's some learning curve in format customization.
Stephen23 on 10 Oct 2018
Edited: Stephen23 on 10 Oct 2018
@Anton: yes, all of the above examples should transpose the array, like this:
fprintf(...,A.')
The fprintf help explains that it "...applies the formatSpec to all elements of arrays A1,... An in column order, and writes the data..." (emphasis added).

Walter Roberson on 10 Oct 2018
Try
num2str(x, 6)

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