Rounding Numerical values in an array to decimal points

How can i round the values in the array to 2 decimasl places. The round functio n does not work with arrays how would i be able to get to the Expected output below?

Code:

a = [12.75687 44.8947584 55.2382 6.34758485]
round =(a,2) 

Expected Output:

[12.76 44.89 55.24 6.35]

[Stephen23]

"The round functio n does not work with arrays"

It does (and always has):

a = [12.75687,44.8947584,55.2382,6.34758485]

a = 1×4

12.7569 44.8948 55.2382 6.3476

b = round(a,2)

b = 1×4

12.7600 44.8900 55.2400 6.3500

[dpb]

Perhaps OP is confusing the number of decimal places printed at the command line with the precision of the answer -- in

b = round(a,2)
b = 1×4
12.7600   44.8900   55.2400    6.3500 

there are still four digits after the decimal displayed.

That is, of course, a fignewton of the format option selected in the command line and is not able to be changed other than for the relatively few available options -- "short", "long", ...

The one that might be of interest here for the specific case of two decimals is

>> a = [12.75687,44.8947584,55.2382,6.34758485];
b = round(a,2)
b =
   12.7600   44.8900   55.2400    6.3500
>> format bank
>> b
b =
         12.76         44.89         55.24          6.35
>> 

But, it has the disadvantage for very large numbers that it is fixed format.

If it is needed to display a specific number of digits, one has to use one of the formatting options with fprintf or the like.

Answer 1

[Leepakshi]

Hi Teoman,

To round numbers in a MATLAB array to two decimal places and ensure they are displayed correctly, you can use the round function and adjust the display format.

Please refer to the following example:

a = [12.75687, 44.8947584, 55.2382, 6.34758485]; 
rounded_a = round(a, 2); 
format shortG; % This sets the display format or  
% format bank % will also work 
disp(rounded_a); 

This code rounds each element of the array a to two decimal places and sets the display format to show fewer decimal places.

Refer to the following documentation on format function:

https://www.mathworks.com/help/matlab/ref/format.html

Please refer to below documentation which can help to get more alternatives using sprintf:

https://www.mathworks.com/help/matlab/matlab_prog/formatting-strings.html

sprint can be used as:

txt = sprintf('Displaying pi: \n %f \n %.2f \n %12f', A);

Hope this helps!