10-20-2014
Quote:
Originally Posted by
Corona688
There are more things than invaders which could alter the file. These file permissions were invented for a reason, long before the internet even existed. They are to prevent you from shooting yourself in the foot.
A program glitch could touch it. You might overwrite it by accident yourself, typing in 'put' instead of 'site exec'. Or any of a thousand things we'd never think of because they don't happen to files which aren't set 777.
In all cases, 'permission denied' is what you'd rather the system do, instead of allowing it to be filled with garbage.
777 is not the magic sledgehammer to solve all problems. Like a real sledgehammer, it makes giant holes.
I do not want any warnings from you about any risk, I know about the risk.
I want a solution for my problem
Greetings from Germany
Peter
---------- Post updated at 12:56 PM ---------- Previous update was at 12:50 PM ----------
Quote:
/etc/ftp-exec is a directory not a file. Try putting your file in that directory.
Yes I have done it, but no work.
I think there is a problem in the configuration and enable this command in FTP.
but I dont know where I can this to configurate
Greetings Peter
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math::fuzzy(3tcl) Tcl Math Library math::fuzzy(3tcl)
__________________________________________________________________________________________________________________________________________________
NAME
math::fuzzy - Fuzzy comparison of floating-point numbers
SYNOPSIS
package require Tcl ?8.3?
package require math::fuzzy ?0.2?
::math::fuzzy::teq value1 value2
::math::fuzzy::tne value1 value2
::math::fuzzy::tge value1 value2
::math::fuzzy::tle value1 value2
::math::fuzzy::tlt value1 value2
::math::fuzzy::tgt value1 value2
::math::fuzzy::tfloor value
::math::fuzzy::tceil value
::math::fuzzy::tround value
::math::fuzzy::troundn value ndigits
_________________________________________________________________
DESCRIPTION
The package Fuzzy is meant to solve common problems with floating-point numbers in a systematic way:
o Comparing two numbers that are "supposed" to be identical, like 1.0 and 2.1/(1.2+0.9) is not guaranteed to give the intuitive
result.
o Rounding a number that is halfway two integer numbers can cause strange errors, like int(100.0*2.8) != 28 but 27
The Fuzzy package is meant to help sorting out this type of problems by defining "fuzzy" comparison procedures for floating-point numbers.
It does so by allowing for a small margin that is determined automatically - the margin is three times the "epsilon" value, that is three
times the smallest number eps such that 1.0 and 1.0+$eps canbe distinguished. In Tcl, which uses double precision floating-point numbers,
this is typically 1.1e-16.
PROCEDURES
Effectively the package provides the following procedures:
::math::fuzzy::teq value1 value2
Compares two floating-point numbers and returns 1 if their values fall within a small range. Otherwise it returns 0.
::math::fuzzy::tne value1 value2
Returns the negation, that is, if the difference is larger than the margin, it returns 1.
::math::fuzzy::tge value1 value2
Compares two floating-point numbers and returns 1 if their values either fall within a small range or if the first number is larger
than the second. Otherwise it returns 0.
::math::fuzzy::tle value1 value2
Returns 1 if the two numbers are equal according to [teq] or if the first is smaller than the second.
::math::fuzzy::tlt value1 value2
Returns the opposite of [tge].
::math::fuzzy::tgt value1 value2
Returns the opposite of [tle].
::math::fuzzy::tfloor value
Returns the integer number that is lower or equal to the given floating-point number, within a well-defined tolerance.
::math::fuzzy::tceil value
Returns the integer number that is greater or equal to the given floating-point number, within a well-defined tolerance.
::math::fuzzy::tround value
Rounds the floating-point number off.
::math::fuzzy::troundn value ndigits
Rounds the floating-point number off to the specified number of decimals (Pro memorie).
Usage:
if { [teq $x $y] } { puts "x == y" }
if { [tne $x $y] } { puts "x != y" }
if { [tge $x $y] } { puts "x >= y" }
if { [tgt $x $y] } { puts "x > y" }
if { [tlt $x $y] } { puts "x < y" }
if { [tle $x $y] } { puts "x <= y" }
set fx [tfloor $x]
set fc [tceil $x]
set rounded [tround $x]
set roundn [troundn $x $nodigits]
TEST CASES
The problems that can occur with floating-point numbers are illustrated by the test cases in the file "fuzzy.test":
o Several test case use the ordinary comparisons, and they fail invariably to produce understandable results
o One test case uses [expr] without braces ({ and }). It too fails.
The conclusion from this is that any expression should be surrounded by braces, because otherwise very awkward things can happen if you
need accuracy. Furthermore, accuracy and understandable results are enhanced by using these "tolerant" or fuzzy comparisons.
Note that besides the Tcl-only package, there is also a C-based version.
REFERENCES
Original implementation in Fortran by dr. H.D. Knoble (Penn State University).
P. E. Hagerty, "More on Fuzzy Floor and Ceiling," APL QUOTE QUAD 8(4):20-24, June 1978. Note that TFLOOR=FL5 took five years of refereed
evolution (publication).
L. M. Breed, "Definitions for Fuzzy Floor and Ceiling", APL QUOTE QUAD 8(3):16-23, March 1978.
D. Knuth, Art of Computer Programming, Vol. 1, Problem 1.2.4-5.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category math ::
fuzzy of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may
have for either package and/or documentation.
KEYWORDS
floating-point, math, rounding
CATEGORY
Mathematics
math 0.2 math::fuzzy(3tcl)