“变量转换”的版本间差异
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(以“==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...”为内容创建页面) |
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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 |
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*[[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 |
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:(1) if no absolute value exceeds 32767, then the array is returned as |
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as a type INTEGER instead of LONG |
as a type INTEGER instead of LONG |
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:(2) NINT will work on strings, e.g. print,nint(['3.4','-0.9']) will |
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give [3,-1], whereas ROUND() gives an error message |
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
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