numeric

Is there any trait that specifies numeric functionality?

You can use num or num-traits crates and bound your generic function type with num::Float, num::Integer or whatever relevant trait: use num::Float; // 0.2.1 fn main() { let f1: f32 = 2.0; let f2: f64 = 3.0; let i1: i32 = 3; println!(“{:?}”, sqrt(f1)); println!(“{:?}”, sqrt(f2)); println!(“{:?}”, sqrt(i1)); // error } fn sqrt<T: Float>(input: T) … Read more

How to convert time (mm:ss) to decimal form in R

Given that you start with a character vector, this is relatively easy : minPerGame <- c(“4:30″,”2:20″,”34:10″) sapply(strsplit(minPerGame,”:”), function(x) { x <- as.numeric(x) x[1]+x[2]/60 } ) gives [1] 4.500000 2.333333 34.166667 Make sure you checked that you used read.csv() with the option as.is=TRUE. Otherwise you’ll have to convert using as.character().

How to only select numeric data from mysql?

You may want to create a user defined function that matches the value against a regular expression: CREATE FUNCTION IsNumeric (sIn varchar(1024)) RETURNS tinyint RETURN sIn REGEXP ‘^(-|\\+){0,1}([0-9]+\\.[0-9]*|[0-9]*\\.[0-9]+|[0-9]+)$’; Source: MySQL Forums :: Microsoft SQL Server :: IsNumeric() clause in MySQL? Truthy Tests: mysql> SELECT ISNUMERIC(‘1’); +—————-+ | ISNUMERIC(‘1’) | +—————-+ | 1 | +—————-+ 1 … Read more