# How I can modify the decimal numbers in a table's column?

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BN on 5 Aug 2021
Commented: Walter Roberson on 8 Nov 2023
I have a table with different values like: 0.5, -0.300, -99, 5, 0, and so on. I want to use the output of this table in a hydrological model so I need to have all values in 1 decimal (even integer values, like 5).
Here is an example:
-5.40000000000000
-2.20000000000000
-3.40000000000000
5
4
-99
0
Are what I have, But I need something like this:
-5.4
-2.2
-3.4
5.0
4.0
-99.0
0.0
I tried something like format long, format long g, and format bank, but they weren't helpful. So if anyone knows the solution I would be grateful if tells me.
Best regards

Chunru on 5 Aug 2021
a = randn(5,1)
a = 5×1
0.1370 -0.9759 -1.3119 2.0201 1.3604
str = sprintf('%.1f\n', a)
str =
'0.1 -1.0 -1.3 2.0 1.4 '
Walter Roberson on 8 Nov 2023
format long g
Column = randn(5,1)
Column = 5×1
-0.474707105013206 1.4443908607698 1.76341706465071 -1.3245954736747 -0.388849281393544
Table = table(Column)
Table = 5×1 table
Column __________________ -0.474707105013206 1.4443908607698 1.76341706465071 -1.3245954736747 -0.388849281393544
Table.Column=round(Table.Column,1)
Table = 5×1 table
Column ______ -0.5 1.4 1.8 -1.3 -0.4
format short
Table
Table = 5×1 table
Column ______ -0.5 1.4 1.8 -1.3 -0.4
Looks to me as if it is working?
Walter Roberson on 8 Nov 2023
for exactly 2 decimal places, if you are using uitable() then set the uitable ColumnFormat property to 'bank'
Note that "bank" format rounds numbers. If you happened to be doing financial work then in some cases, floor is prefered to rounding; in such a situation you should use the somewhat-new round TieBreaker option.

Awais Saeed on 5 Aug 2021
You want to display the numbers as shown or modify them? In case you want to modify them, you can use
number = -99.32345; % the number you want to modify
num_str = num2str(number); % convert it to string
[idx,~]=regexp(num_str,'[.]'); % search for decimal point
num_str(idx+2:end) = []; % delete everything from idx+2 till end
number = str2num(num_str) % convert result back to number
You can use this in a loop to modify all of your values.

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