送交者: neo6 于 2005-5-25, 01:26:36:

I saved double type to file simply using fprintf (file, "%lg\n", data)
and later load it using fscanf (file, "%lg\n", &data)
these data then go through some fft stuff

I found this only save 6 or 7 digits, however, previously it works fine

but recently I got some weired results when my data is 32k, 64k, 128k

I am wondering wether the precision loss during the simple save and load caused this

do you think this could be a cause?

also what's the standard way to save and load double type to a text file? I am now change to fprintf(file, "%30.16lg\n", data) but I prefer some standard way to do that

thanks

• 试试 %lf. 我总是用它. - 江毅 (11 bytes) 2005-5-25, 18:17:59
• thanks guys, but I need the data file to be human readable - neo6 (83 bytes) 2005-5-25, 12:56:28
  • Create your own routine - Duke (188 bytes) 2005-5-25, 14:45:03
• you can also use binary output - cms (101 bytes) 2005-5-25, 03:42:43
• the simplest way is to cast the double into int*, then - steven (260 bytes) 2005-5-25, 03:27:53
  • btw, if your compiler support long long, you can use long long - steven (104 bytes) 2005-5-25, 03:36:12
• it also annoys me the default %lg does not save all digits - neo6 (4 bytes) 2005-5-25, 01:29:03

加跟贴