How to Build Data in MATLAB

In some cases common programs use the initials of data in the form of a matrix or array, such as zero matrix, identity matrix and others. Simply MATLAB provides several techniques to build data quickly, as follows:

-Building data-elements that have been determined.
For example you will build the data x with a known value, then the way of writing as follows:
i. row vector data:
>> x = [1 3 5]
x =
     1 3 5

ii. column vector data
 >> x=[1;3;5]
x =
    1
    3
    5

iii. for the data matrix form
 >> x = [1 3 5;2 4 6]
x =
    1   3   5
    2   4   6

-Build data with initial boundary and final boundary.
Suppose you want to create a data point from the point of 10 degrees to 15 degrees, then the way the writing is as follows:
>> ang = [10:15]
ang =
    10 11 12 13 14 15

-Establish initial boundary data, increment and final boundary
Suppose you want to create a data point from the point of 10 to 50 degrees with a 10 increase, then the way its writing is as follows:
 >> ang = [10:10:50]
ang =
     10   20   30    40    50

-Establish initial boundary data and the deadline, but the amount of data specified
Suppose you want to make 5 pieces of data in the interval angle angle 30 degrees to 70 degrees, then the way his writing is as follows:
 >> ang = linspace(30,70,5)
ang =
     30  40  50  60  70

-Building a logarithmic data with initial boundary and final boundary, but the amount of data specified.
Suppose you want to create 5 data values within the interval 10 and 100, then the way is as follows:
>> y = logspace(1,2,5)
y =
    10.0000   17.7828   31.6228   56.2341  100.0000

-Establish data using standard MATLAB matrix
How to create a data matrix with all elements of value 1:
 >> x = ones(2,3)
x =
    1   1   1
    1   1   1

Create a data matrix with all elements of value 0;
>> x  =  zeros(2,3)
x =
    0   0   0
    0   0   0

Making identity matrix of data, do the following:
 >> x  =  eye(2,2)
x =
   1   0
   0   1

-Building Data-Random
Random data is very often used in programming, particularly the field of mathematical modeling. MATLAB provides a quick way to generate random data as follows:
>> x  =  rand(3,3)
x =
    0.9501    0.4860    0.4565
    0.2311    0.8913    0.0185
    0.6068    0.7621    0.8214

Seen that the generated random data is in the interval 0 and 1. Then how to generate random data with other intervals, such as intervals 2 and 4?

Here is syntax to generate data with random intervals:
variable = (end-(rand () * (end-start)))

Example of usage in the program are as follows:
>> x  =  (4-(rand(3)*(7-5)))
x =

    3.1106    2.1564    3.1886
    2.7691    2.5236    2.1291
    2.4161    3.6475    2.1662

1 comments:

Priyanka Bhavsar said...

can i extrapolate any observed data....

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