TIP: 255 Title: Add 'min' and 'max' [expr] Functions Version: $Revision: 1.6 $ Author: Jeff Hobbs State: Final Type: Project Tcl-Version: 8.5 Vote: Done Created: 21-Jul-2005 Post-History: ~ Abstract This TIP proposes enhancing the Tcl '''expr''' command with '''min''' and '''max''' functions. ~ Rationale Many programs need to find the minimum or maximum of a set of numbers, so having functions to do this will make many script programmers' lives easier. This will be adopting yet another feature from TclX, but with the minor enhancement of being able to handle arbitrary numbers of arguments. ~ Specification The '''min''' and '''max''' functions shall be created using Tcl commands (in a namespace such all namespaces will pick them up by default) in the new 8.5 '''expr''' function style (see [232]). They will take one or more numeric arguments (of any valid numeric type) and return the minimum or maximum value of those numbers (depending on which function was invoked). ~ Examples | expr {min(0,3,1)} | => 0 | expr {max(4.2, 0xF, wide(1))} | => 15.0 | expr {min(4.2)} | => 4.2 | expr {min()} | => too few arguments for math function ~ Reference Implementation [[To be uploaded to SourceForge and URL added to this TIP.]] ~ Copyright This document has been placed in the public domain.