“变量转换”的版本间差异
跳到导航
跳到搜索
无编辑摘要 |
|||
第12行: | 第12行: | ||
*整数范围很小(long),要转换大的整数,加上/L64 |
*整数范围很小(long),要转换大的整数,加上/L64 |
||
*[[astro_lib]]中的nint程序,可以代替round,而且 |
*[[astro_lib]]中的nint程序,可以代替round,而且 |
||
:(1) if no absolute value exceeds 32767, then the array is returned as |
:(1) if no absolute value exceeds 32767, then the array is returned as a type INTEGER instead of LONG |
||
⚫ | |||
as a type INTEGER instead of LONG |
|||
⚫ | |||
give [3,-1], whereas ROUND() gives an error message |
2012年9月19日 (三) 01:49的版本
浮点数转成整数
- round:四舍五入
IDL>print,round(5.1),round(5.9) IDL> 5, 6
- ceil:向上进
IDL>print,round(5.1),round(5.9) IDL> 6, 6
- floor:截取整数
IDL>print,round(5.1),round(5.9) IDL> 5, 5
- 整数范围很小(long),要转换大的整数,加上/L64
- astro_lib中的nint程序,可以代替round,而且
- (1) if no absolute value exceeds 32767, then the array is returned as a type INTEGER instead of LONG
- (2) NINT will work on strings, e.g. print,nint(['3.4','-0.9']) will give [3,-1], whereas ROUND() gives an error message