Login or Register to Ask a Question and Join Our Community


Programming

Trigonometry missing?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Programming Trigonometry missing?
# 8  
Old 07-22-2011
On the contrary, your math.h is complete (there's a standard, after all, what has to be provided). If you use a function that's not defined, you'd get a warning about an "implicit declaration". But as pflynn said above: you have to explicitly link the math library, using the -lm switch.
# 9  
Old 07-22-2011
OK now it works...I must link libm with -lm
gcc trig.c -lm -o trig

Is this kind of trig faster than using a table?
I have seen that some routines for FFT are using a table with sin/cos data.
# 10  
Old 07-22-2011
So, I was right:

Quote:
(...)most of the questions related to the use of the GNU Libc mathematical funcions have to do with linking time problems. To compile and link programs that use the functions from the mathematical library, you need to explicitly tell gcc (or g++) to link your program agaist the library(...)

Code:
gcc -o trig trig.c -lm

# 11  
Old 07-22-2011
Quote:
Originally Posted by Pelle-48
Is this kind of trig faster than using a table?
A table would have fantastic speed but very poor accuracy; the lilbrary routines are built for maximum accuracy on the assumption they may be put to scientific or mathematical use.

If you'd posted what your error message was in the first place we could have solved your problem in one post instead of two pages.
Last edited by Corona688; 07-22-2011 at 03:14 PM..
Login or Register to Ask a Question

Previous Thread | Next Thread

8 More Discussions You Might Find Interesting

1. Red Hat

Yum - resolving missing dependencies that are not missing

I am trying to install VirtualBox on RHEL 5 but I need the 32 bit version for 32 bit Windows. When I run yum I get the following: sudo yum localinstall /auto/spvtg-it/spvss-migration/Software/VirtualBox-4.3-4.3.2_90405_el6-1.i686.rpm Loaded plugins: fastestmirror Setting up Local Package... (13 Replies)
Discussion started by: gw1500se
13 Replies

2. SuSE

How to resolve missing missing dependencies with opensuse 11.3 and 12.3?

Hello, This is a programming question as well as a suse question, so let me know if you think I should post this in programming. I have an application that I compiled under opensuse 12.2 using g77-3.3/g++3.3. The program compiles and runs just fine. I gave the application to a colleague who... (2 Replies)
Discussion started by: LMHmedchem
2 Replies

3. Shell Programming and Scripting

[: missing `]'

Hi, I am getting this error while running the following code. i=`awk '{print $2}' test1.txt` j=`awk '{print $4}' test1.txt` k=`awk '{print $6}' test1.txt` if ; then echo "Up." else echo "down" fi rm -f test.txt test1.txt error is this: line 12: ' Please suggest. (2 Replies)
Discussion started by: arijitsaha
2 Replies

4. Shell Programming and Scripting

trying to use logical or and i must be missing something

greetings, i am trying to force the user to ensure that $CPUS equals 12 or 24. it cannot be any other value including null. after the expr statement $AMT needs to equal 1 or 2. how i read the line in question is "if $CPUS is zero/null or not equal to 12 or not equal to 24" then issue the message,... (5 Replies)
Discussion started by: crimso
5 Replies

5. UNIX for Dummies Questions & Answers

libz.so missing

Hi, This is a new problem that I have since few days back. I have a CVS working on HP Unix, which apparently needs libz.so. Suddenly this libz.so seems to be missing. $ cvs /usr/lib/hpux32/dld.so: Unable to find library 'libz.so'. Killed almost like the file disappeared from the... (3 Replies)
Discussion started by: tibork
3 Replies

6. UNIX for Advanced & Expert Users

Is this strange or am I missing something.

Hey Guys, Saw something weird today on the unix server. I got a normal access (non-root) to a new server. But when I had a look at the /etc/passwd file, it did not contain my login id. Atleast this is the first time I saw it ever happening.Has anyone come across such a situation and does... (4 Replies)
Discussion started by: nua7
4 Replies

7. Linux

missing in script

Hi , I am trying to make this change work in my script but its not working.The idea is to grep for "CREATE VIEW" and then change view name from orig to VW_orig. but the problem comes when there is no schema prefix to the view name . the code I am using is #!/bin/ksh... (5 Replies)
Discussion started by: capri_drm
5 Replies

8. Shell Programming and Scripting

what am I missing?

I have the following portion of a script Check() { echo "\n\nChecking that all constraints are Enabled" echo "..." sleep 2 CHECK_COUNT='sqlplus -s $1 <<-EOSQL4 set feed off pause off pages 0 head off; set linesize 150 echo off; select count(*) from user_constraints where... (4 Replies)
Discussion started by: Zelp
4 Replies
Login or Register to Ask a Question