splitting a number into the integer and decimal parts GNUPLOT

Question

Is there any way to split a number into its integer and decimal parts?

I've tried the int() "function":

int(5.5) = 5.

But I've got no idea how do I get the decimal?

Example:

(I have)

a = 12.34

(I want)

b = 12
c = 34

a = 12.34

b = int(a)

c = ????

Thanks!!!!

(Update)

My specific problem, here we have (thanks again for the support)

I have a set of data, with different blocks. For each block, I want to make the same plot. The title of the plot and the name of the output png depends on the block.

With this goal in mind I've created a loop

do for [j=0:int(A_blocks-2)]{

i=0 + 0.4*j

set output 'Mz_NMcs5000_Hext'.i.'_JC1_JSn05_JIntn05_R11_tSh2.png'

set title "H = '.i.'  J_C = 1  J_S = J_{Int} = - 0.5"

plot filename index j using 1:5 w lp pt 5 lt rgb "black" title "Mag_T", "" index j u 1:20  w lp pt 9 lt rgb "red" title "Mag_{Int-S}"
}

The problem I have is that I only can concatenate using the dot if the value is an integer. I get this error:

internal error : STRING operator applied to undefined or non-STRING variable

Welcome to StackOverflow! Well, adding unrelated code doesn't help not getting rejected. If the question is clear and neither a duplicate nor obvious to answer by a simple web search you will get an answer. Should 1.23 return 23, and 1.230 return 230? What do you want to do with the result? — theozh
– theozh, Commented Apr 9, 2021 at 13:16
Thanks! I'm new with this and still trying to guess how it works — Troncho Col
– Troncho Col, Commented Apr 9, 2021 at 13:25
that's fine. So, do you want 23 or 230 in case of 1.230? What do you want to get for example for 5.001... 1? and what do you want to get for 5.01 and 5.1? 1 as well? I doubt. Please clarify. — theozh
– theozh, Commented Apr 9, 2021 at 13:39
ok. this looks like a xy-problem, see meta.stackexchange.com/questions/66377/what-is-the-xy-problem What do you actually want to achieve? Including a float number into a filename and a title? — theozh
– theozh, Commented Apr 9, 2021 at 14:14
Yes, I want to include a float number into a filename and title. Exactly that! — Troncho Col
– Troncho Col, Commented Apr 9, 2021 at 14:19

theozh · Accepted Answer · 2021-04-09 14:20:12Z

1

If you want to include a float number into a title or a file name use the string formatting via sprintf(), check help sprintf and help format specifiers.

a = 1.234
myFile = sprintf("MyFileName_%g_MoreParameters.png",a)
print myFile

Result:

MyFileName_1.234_MoreParameters.png

answered Apr 9, 2021 at 14:20

theozh

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Ethan · Accepted Answer · 2021-04-09 21:11:07Z

1

Your question seems to have shifted, but the answer to the original question as asked is

gnuplot> a = 5.5555555555555
gnuplot> b = a - floor(a)
gnuplot> print b
0.5555555555555

answered Apr 9, 2021 at 21:11

Ethan

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3 Comments

Troncho Col Over a year ago

Thanks!!! And is there a way to convert 0.555555555 into an integer 555555555 ?

Ethan Over a year ago

That is not a uniquely-defined operation. How many decimal places of precision to keep? Round up or round down?

Troncho Col Over a year ago

Well, I guess that for 0.123 ---> 123 and for 1.203500 ---> 2035. Now, it isn't a big deal, cause I need it for the title and output file name. Thanks again.

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