Need some advices how to increse accuracy of the algorithm
Hi guys
Can you raccomand some what I can do to increse accuracy of the Newton-Raphons method. It's not very accurate.
Code:
// Implementation of Newton - Raphson method for
// determination square root od positive number
// Date: 10. april 2011
// Author: Solaris_user
// Solution for programming exercise 13
#include <stdio.h>
int main(void) {
double tolerance, input, y, x = 1.0;
// Ask user to enter some number to find square root
// if user enters negative number then re-ask for new input
// input must be greater then numbers zero and one.
// also user must enter some tolerance which will controll loop
// test condition
printf("Newton - Raphson square root algorithm\n");
do {
printf("Enter some number to find squre root: ");
scanf("%lf", &input);
if (input <= 1) {
printf("Can't find square root for input number\n");
}
} while (input < 1);
do {
printf("Enter desired tolerance ( < 0.01): ");
scanf("%lf", &tolerance);
if (tolerance >= 0.01) {
printf("Too small tolerance\n");
}
} while (tolerance >= 0.01);
// Newton - Raphson method:
// start with x = 1.0. Then set y = (x + input/2) / 2 . If x and y are not
// close enough then set x = y, stop when difference is small enough
// to be negligible.
do {
y = (x + (input / 2) ) / 2;
if (x > y ) {
x = y;
}
} while ( (x - y) > tolerance);
printf("Square root is %.7lf\n", y);
return 0;
}
This is my output
Code:
Solaris:~/Desktop> ./a.out
Newton - Raphson square root algorithm
Enter some number to find squre root: 9
Enter desired tolerance ( < 0.01): 0.00000001
Square root is 2.7500000
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LEARN ABOUT V7
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS -raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO ppm(5)AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)
04-10-2011
