Decimal number between 0 and 1 without the integer part?

Hi, I am trying to plot some outputs on a graph as text and I am basically plotting several points and need to conserve on space. Is there anyway I can plot a number between 0 and 1 , for eg, "0.25" as ".25" ignoring the 0? This is to be plotted as text() on the graph and so I'm using the num2str(x,y) function.

[John BG]

Hi Rahul

this is John BG [e-mail]

per isakson answer only takes 2 decimals, regardless of the actual amount of decimals.

Wouldn't it make more sense to first measure the amount of decimals and then generate a string with all decimals?

[Jan]

@John BG: What is the "actual amount of decimals"?

sprintf('%.17g', 0.1 + 0.1 + 0.1)
0.30000000000000004

Because most decimal number do not have an exact representation in the binary IEEE754 format, it would be required to round to a certain number of decimals before you can decide, how many decimals a number has. This will be more or less arbitrary.

If there is enough space for more digits, Rahul can simply use num2str(x, 3) or even omit the specification of the number of digits.

Answer 1

[per isakson]

This code strips off leading zeros; replaces leading zeros with an empty string.

>> str = regexprep( num2str( 0.25, 2 ), '^0*', '' )
str =
.25
>>

[Jan]

Or:

strrep(sprintf('%.2f', 0.25), '0.', '.')