Literally convert decimal to string

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Ganesh Gebhard 2021-4-24

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回答： Jan 2021-4-26

采纳的回答： Jan

Hey!

I hope I have a simple question, I just couldn't figure it out.

I have several numbers which I want to be converted to string quite literally:

12.000 -> '12.000'

4.0 -> '4.0'

34.760000 -> '34.760000'

As you can see, I cannot simply pad zeros, since that highly depends on how many zero are given with the number.

Does anyone know how to do this?

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Ganesh Gebhard 2021-4-26

I solved it quickly by providing the number of zeros after the comma as a variable, so that for each number the user has to input the numbers of zeros as well. Maybe not the best way, but it did the trick for the iteration.

Scott MacKenzie 2021-4-26

编辑：Scott MacKenzie 2021-4-26

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Is the idea to replicate MATLAB's format for numbers appearing the command window? In this case, here's an idea that might help (but requires R2021a). Use fmt = format to get the current display format. fmt is a DisplayFormatOptions object. Query the DisplayFormatOptions object and respond accordingly:

format short
x = 5/4
fmt = format;
fmt.NumericFormat
% "short", therefore 4 digits after decimal point
format long
x
fmt = format;
fmt.NumericFormat
% "long", therefore 15 digits after decimal point

Output:

x =

1.2500

ans =

"short"

x =

1.250000000000000

ans =

"long"

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Jan 2021-4-26

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If the values are stored as floating point numbers in double or single format, they do not have trailing zeros. Trailing zeros after the decimal point are not defined mathematically, as well as leading zeros before the point.

So if you reall have a 12.000 anywhere, this is either a char vector or string, or this comes from choosing a specific output format:

x = 12
x = 12
format long
x
x = 
    12
format shortEng
x
x = 
    12.0000e+000
% Or explicitly:
fprintf('%d\n', x)
12
fprintf('%f\n', x)
12.000000
fprintf('%.3f\n', x)
12.000

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MATLAB Language Fundamentals Data Types Characters and Strings

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