Stata 15 help for float()

[FN] Programming functions


float(x) Description: the value of x rounded to float precision

Although you may store your numeric variables as byte, int, long, float, or double, Stata converts all numbers to double before performing any calculations. Consequently, difficulties can arise in comparing numbers that have no finite binary representations.

For example, if the variable x is stored as a float and contains the value 1.1 (a repeating "decimal" in binary), the expression x==1.1 will evaluate to false because the literal 1.1 is the double representation of 1.1, which is different from the float representation stored in x. (They differ by 2.384 x 10^(-8).) The expression x==float(1.1) will evaluate to true because the float() function converts the literal 1.1 to its float representation before it is compared with x. (See [U] 13.12 Precision and problems therein for more information.) Domain: -1e+38 to 1e+38 Range: -1e+38 to 1e+38

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