Keeping a zero after a decimal

Hi! I'm relatively new to MATLAB and am trying to round the values within this column vector to three significant digits. This has worked fine except for the second entry, which fails to keep a zero after the decimal point when rounded. If I have a vector: A = [27.372; 24.966; 28.908; 29.205; 23.783; 27.256], no matter whether I use: result = round(A, 3, 'significant') or result = round(A, 1), both produce the following: 27.4; 25; 28.9; 29.2; 23.8; 27.3. I would like the second row to be 25.0. Any help is much appreciated! Cheers :)

[Stephen23]

"which fails to keep a zero after the decimal point when rounded"

Are you trying to display the values or do you want to perform some numeric operations on them?

[Laya Rahbar Nikoukar]

Hi! I have the same question as Andre Dixon. I want to display the values and the zeros after decimal should be displayed. Could you help me further?

[Stephen23]

" I want to display the values and the zeros after decimal should be displayed. Could you help me further?"

Use sprintf, fprintf, num2str, etc, and specify the format to show as many decimal places you wish:

>> sprintf('%.2f',2.5)
ans = 2.50

[Laya Rahbar Nikoukar]

Thanks a lot!

[per isakson]

On R2016a

>> round( A, 3, 'significant')
ans =
   27.4000
   25.0000
   28.9000
   29.2000
   23.8000
   27.3000
>> round( A, 1 )
ans =
   27.4000
   25.0000
   28.9000
   29.2000
   23.8000
   27.3000
>>

format short controls the number of digits being displayed.

"I want to display the values" display where and by what mean?

[Kurt]

A = [27.372; 24.966; 28.908; 29.205; 23.783; 27.256]

A = 6×1

27.3720 24.9660 28.9080 29.2050 23.7830 27.2560

display(sprintf('%0.1f\n',round(A,1)));

27.4
25.0
28.9
29.2
23.8
27.3

[Stephen23]

@Kurt: SPRINTF() also performs rounding, so the separate ROUND() call is not required:

A = [27.372; 24.966; 28.908; 29.205; 23.783; 27.256];
fprintf('%0.1f\n',A)

27.4
25.0
28.9
29.2
23.8
27.3

Answer 1

[Christopher Coello]

Well not sure about the question. But if what you want is display the vector with trailing zero then you can use the undocumented sprintfc command

A = [27.372; 24.966; 28.908; 29.205; 23.783; 27.256];
% with one decimal digit
sprintfc('%0.1f',A)
% with two decimal digits
sprintfc('%0.2f',A)
% with five decimal digits 
sprintfc('%0.5f',A)

[Jos (10584)]

not undocumented anymore :D

[Christopher Coello]

Is it ? I get

No results for sprintfc.

in Help search filed for R2017b

[Jos (10584)]

O, sorry, it still is undocumented

[Guillaume]

sprintfc has never been documented.

Since R2016b, it is also no longer needed. The documented compose function does the same thing better.

[Christopher Coello]

Nice, I like compose ! Thanks Guillaume, I'll definitely drop sprintfc now

[Elysi Cochin]

Thanks @Guillaume