Command reference, MATLAB Programming

Assignment Help:

Matlab Command Reference

1. Getting Help:

The help command is used to find the functions and its syntax. Similarly, lookfor is used to find the functions or topics. For example:

help power

Another example:

lookfor integration

2. Arithmetic Equations:

+,-,* and / are the arithmetic operators. These operators are used in arithmetic expression.+ meansaddition, - meanssubtraction,* meansmultiplication and/ means division.

For example:

            » 5+6/4*2-6

ans =     2

3. Accuracy of Operations:

The eps(x)function used to set the accuracy of floating number. For example:

            » eps(4)

» power(sqrt(2),2)-2

ans =  4.4409e-016

4. Order of operations:

BEDMAS means Bracket, Exponential, Division/Multiplication and Addition/Subtraction. It is very important in arithmetic operations. For example:

            » 5+6/4*2-6

ans =     2

5. Trigonometric Functions:

Sin(x),cos(x), tan(x) and so on are the trigonometric functions.

» tan(45*pi/180)

ans =    1.0000

Here 45 numbers is converted into 45 degree.

6. Exponential and log functions:

exp(x) is the exponential of the elements of x, e to the x.

For complex Z=X+i*Y, EXP(Z) = EXP(X)*(COS(Y)+i*SIN(Y)).

log(x) is the natural logarithm, log10(x)is the base 10 logarithm. For example:

» exp(3)

ans =   20.0855

» log10(10)

ans =    1

7. Vectors:

A Matlab vector is list of values which can be used in function evaluations or arithmetic expressions. For example:

» x=[1:0.5:3]

x =    1.0000    1.5000    2.0000    2.5000    3.0000

Start Value=1

Step Value=0.5

Stop Value=3

 

8. Vector Arithmetic:

To perform element by element multiplication and division, use "dotted" operators. For example:

     » x=[3:0.2:4]

x =    3.0000    3.2000    3.4000    3.6000    3.8000    4.0000

» y=[2:0.5:4.5]

y =    2.0000    2.5000    3.0000    3.5000    4.0000    4.5000

» x.*y

ans =    6.0000    8.0000   10.2000   12.6000   15.2000   18.0000

9. Plotting vectors:

The plot command is used to make x-y plots. For example:

     » x=[3:0.2:4]

x =    3.0000    3.2000    3.4000    3.6000    3.8000    4.0000

» y=[2:0.5:4.5]

y =2.0000    2.5000    3.0000    3.5000    4.0000    4.5000

» plot(x,y)

1722_Command Reference.png

Figure: Plot a line graph of two vector values

 

10. Printing the Plots

» print('-djpeg','Lab1.jpeg')

This command is used to convert the plot into jpeg picture format.

11. 3D Plots

The above plots are two dimensional graphics. Now we study about the three dimensional graphics.

z=peaks(25);       

mesh(z);  

12. Data Type Conversion

These types of functions are used to convert from one data type to another one. For example:

            q=5;

title(['Area = ',num2str(q)]);    

ans     Area=5

13. Limit the Decimal Part

Round function is used to round towards nearest integer. Similarly Floor, Ceil and Fix functions are also related to Round function. For example:

x =2.4455

» round(x)

ans = 2

14. Square and Power Functions

sqrt(x)function is used to calculate the square root the value of x. Similarly,the power function is used to calculate the power of the value of x. For example:

 » a=30

a = 30

» sqrt(a)

ans = 5.4772

     » power(a,1/2)

ans = 5.4772

15. Conversion

If we need to change from decimal to binary or decimal to octal we use bin2dec and dec2binfunctions. For example:

            » dec2bin(5)

ans = 101

» bin2dec('101')

ans = 5


Related Discussions:- Command reference

Create a vector representing x coordinates of a measurement, Problem 1. Cr...

Problem 1. Create a vector representing x coordinates of a measurement with 20 points between 0 and 10. Create another vector y representing fake measurements which are related to

linear differential equation in matlab, Problem 1:   What are the di...

Problem 1:   What are the different methods that can be used to solve a differential equation? Please provide a numbered list. Problem 2:   For a first order linear d

Write a matlab function, There are many approaches to numerically estimatin...

There are many approaches to numerically estimating the derivative of the function.  The relationship:   is called a forward difference, since the estimate of the derivativ

Program for add sinusoid with frequency, Job: Add sinusoid with frequency 1...

Job: Add sinusoid with frequency 1000 Hz and amplitude 100 to the one generated in Job 1 (: Create a function using mat lab to generate a sinusoidal signal. The parameters of the s

Documentation - script, Documentation: It is very important that all t...

Documentation: It is very important that all the scripts be documented well, so that the people can understand what the script does and how it accomplishes that. One way of do

Excel, Ask question Excel Ch 1.A-Grader Project-Training Workshops 1.5#Mini...

Ask question Excel Ch 1.A-Grader Project-Training Workshops 1.5#Minimum 100 words accepted#

Solve the system of linear equations - matlab, Problem 1.  Use Matlab to so...

Problem 1.  Use Matlab to solve the following system of linear equations: 2x + y + 3z = 1 2x + 6y + 8z = 3 6x + 8y + 18z = 5 Capture Matlab code and the result in a text fi

Solving 1st order differential equations, Hi, I need help with solving five...

Hi, I need help with solving five-1st order ODE which are coupled. I need to plot these as well. Could I please get a quote. Thanks

Compute the sum of all the columns of a matrix, 1. Enter the 3×4 matrix ...

1. Enter the 3×4 matrix Let a ij denote the entry of A in the ith row and jth column. Use Matlab to compute the following : (a) a 13 + a 32 (b) Three times the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd