HOW DO I DO THAT IN MATLAB SERIES?

In this series, I am answering questions that students have asked me about MATLAB.

TOPIC
SUMMARY
INTRODUCTION
INPUTS
DISPLAYING INPUTS
THE CODE
DISPLAYING OUTPUTS

TOPIC

How to use logarthemic and trignometric functions in MATLAB

SUMMARY

Language : Matlab 2008a; Authors : Sri Harsha Garapati, Daniel Miller, Autar Kaw; Mfile available at Last Revised : January 17, 2012; Abstract: This program shows you an how to use logarthemic functions and trignometric functions.

clc
clear all

INTRODUCTION

disp('ABSTRACT')
disp('   This program shows you an how to use logarthemic functions and')
disp(' trignometric functions and also how to use inverse trignometric')
disp(' functions ')

disp(' ')
disp('AUTHOR')
disp('   Sri Harsha Garapati, Daniel Miller and')
disp('Autar K Kaw of http://autarkaw.wordpress.com')
disp(' ')
disp('MFILE SOURCE')
disp('   http://numericalmethods.eng.usf.edu/blog/logsandtrig_sec001_blog.m')
disp(' ')
disp('LAST REVISED')
disp('   January 17, 2012')
disp(' ')

ABSTRACT
   This program shows you an how to use logarthemic functions and
 trignometric functions and also how to use inverse trignometric
 functions 
 
AUTHOR
   Sri Harsha Garapati, Daniel Miller and
Autar K Kaw of http://autarkaw.wordpress.com
 
MFILE SOURCE
   http://numericalmethods.eng.usf.edu/blog/logsandtrig_sec001_blog.m
 
LAST REVISED
   January 17, 2012

INPUTS

a=4; %Input variable, a
b=5; % Input variable,b
c=2.4; % Input Vatiable,c
ang =30;            %Input variable"ang", representing angle given in degrees
d=0.87;             % side measurement 1
e=0.5;              % side measurement 2

DISPLAYING INPUTS

disp('INPUTS')
fprintf('  The input number a is %g \n',a)
fprintf('  The input number b is %g \n',b)
fprintf('  The input number c is %g \n',c)
fprintf('  The input angle is %g \n',ang)
fprintf('  The input number d is %g \n',d)
fprintf('  The input number e is %g \n',e)

INPUTS
  The input number a is 4 
  The input number b is 5 
  The input number c is 2.4 
  The input angle is 30 
  The input number d is 0.87 
  The input number e is 0.5

THE CODE

Natural log of variable a (command is log)

alog=log(a);    % natural log

% Logs with a base of 10 of variable b (command is log10)
l10b=log10(b);  % log base 10

% exp function (the command is exp)
f=exp(c);      % exp raised to the 2.4

% trig functions (angle measurement input in radians)
angr=ang*(pi/180);  %convert to radians
sin30=sin(angr);    %sine command
cos30=cos(angr);    %cosine command
tan30=tan(angr);    %tangent command

% inverse trig functions
invsin=asin(d);     % inverse sine

invcos=acos(e);     % inverse cosine

DISPLAYING OUTPUTS

disp('  ')
disp('OUTPUTS')
fprintf('  The natural log of %g is %g\n',a,alog)
fprintf('  The log (base 10) of %g is %g\n',b,l10b)
fprintf('  e^%g is %g\n',c,f)
fprintf('  sin(%g) = %g\n',angr,sin30)
fprintf('  cos(%g) = %g\n',angr,cos30)
fprintf('  tan(%g) = %g\n',angr,tan30)
fprintf('  The inverse sine of %g is %g\n',d,invsin)
fprintf('  The inverse cosine of %g is %g\n',e,invcos)

  
OUTPUTS
  The natural log of 4 is 1.38629
  The log (base 10) of 5 is 0.69897
  e^2.4 is 11.0232
  sin(0.523599) = 0.5
  cos(0.523599) = 0.866025
  tan(0.523599) = 0.57735
  The inverse sine of 0.87 is 1.0552
  The inverse cosine of 0.5 is 1.0472