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how to make matlab display full number digits

Asked by Talaria on 6 Aug 2011
Latest activity Edited by Mark Bower on 20 Oct 2017

how to make matlab output the full number in digits, and not in exponential form?

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4 Answers

Answer by Oleg Komarov on 6 Aug 2011
 Accepted Answer

format long

or

sprintf('%16.f',2332456943534324)

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Answer by Image Analyst
on 7 Aug 2011

"format long" won't do it. See my example. You can use fprintf() to print to the command window (again, see example), or sprintf() to save into a variable or display in the command window if (and save to "ans") if you don't assign a variable to the return value and leave off the semicolon.

fprintf('\nFirst, using format long...\n');
format long
m = rand(1,3)/1000
fprintf('\nNow, using fprintf()...\n');
fprintf('%.8f ', m)
fprintf('\n\nNow, using sprintf()...\n');
sprintf('%.8f ', m)

Results in the command window:

First, using format long...
m =
  1.0e-003 *
   0.549723608291140   0.917193663829810   0.285839018820374
Now, using fprintf()...
0.00054972 0.00091719 0.00028584 
Now, using sprintf()...
ans =
0.00054972 0.00091719 0.00028584 

I don't know of anyway to have it operate like you want by default without issuing a command like fprintf().

  2 Comments

format long g

helps. However, integers that exceed 2^53 will be represented in scientific notation with "format long g". To get the full digits of those, you need to use sprintf() or fprintf()

Yes it can help. Sometimes some sneak through even with that (if there would be more than three 0's to the right of the decimal point), like this which I tried:

m =
Columns 1 through 4
0.000538342435260057 0.000996134716626886 7.81755287531837e-005 0.000442678269775446
Columns 5 through 8
0.000106652770180584 0.000961898080855054 4.63422413406744e-006 0.000774910464711502

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Answer by Huw S
on 31 Jan 2017

If you don't need to know all the decimal points, then do your equation inside round.

saves all the other bother of exponentials.

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Unfortunately not the case:

>> format short
>> round(2^54)
ans =
   1.8014e+16
>> format long g
>> round(2^54)
ans =
       1.8014398509482e+16
>> uint64(2^54)
ans =
uint64
 18014398509481984

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Answer by Mark Bower on 20 Oct 2017
Edited by Mark Bower on 20 Oct 2017

A nice, consistent solution is to use "num2str()". The same call works for both display from the command line:

> val = 1234567890
val =
     1.234567890000000e+09
> num2str(val)
ans =
1234567890

and also within print statements:

> sprintf(num2str(val))
ans =
1234567890

It also works for floating point numbers:

> val = 123456.789  
val =  
     1.234567890000000e+05
> sprintf(num2str(val))  
ans =
123456.789
> 

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