DATA VISUALISATION

 

OBJECTIVE

• To visualize the data in different ways

LEARNING OUTCOMES

• After the completion of this experiment students will be able to plot data using scatter, boxplot, histogram, bar functions

SOFTWARE USED:

                 MATLAB^® R2017a

1. Plot a cosine signal added with random noise using scatter plot

PROGRAM

x = 0:0.01:10;

len=length(x);

y = cos(x) + rand(1,len);

sz = 25;

c = 0:0.01:10;

scatter(x,y,sz,c,'filled')

title('Scatter plot: Cosine signal added with a random noise')

OUTPUT

2  

2. Plot some random data using scatter plot

PROGRAM

x = rand(1000,1);

y = rand(1000,1);

s = scatter(x,y,[],'k');

OUTPUT

3.Plot the bar plot of the data y= [75 91 105 123.5 131 150 179 203 226 249 281.5] having values on the x axis as [1900:10:2000].

PROGRAM

x = 1900:10:2000;

y = [75 91 105 123.5 131 150 179 203 226 249 281.5];

bar(x,y)

OUTPUT

 

4. Plot the bar plot of the matrix

                                                2        6        9

                                                11     22      32

 

Against x as [1980 1990]

PROGRAM

x = [1980 1990];

y = [2 6 9;11 22 32];

bar(x,y)

OUTPUT

 

5. Plot the bar plot of some random data

PROGRAM

clc ;

clear all;

close all;

x = rand (1,5)

y = rand (1,5)

bar (x, y);

OUTPUT

6. Plot the histogram of some random data, with the number of bins specified

PROGRAM

x = randn(1000,1);

nbins = 25;

h = histogram(x,nbins) 

OUTPUT

7. Plot the data [57, 57, 57, 58, 63, 66, 66, 67, 67, 68, 69, 70, 70, 70, 70, 72, 73, 75, 75, 76, 76, 78, 79, 81] using box plot.

PROGRAM

x=[57, 57, 57, 58, 63, 66, 66, 67, 67, 68, 69, 70, 70, 70, 70, 72, 73, 75, 75, 76, 76, 78, 79, 81];

boxplot(x)

OUTPUT

8. Define ‘t’ as an array (-10, 10) with an increment of 0.01. Plot

(i) cos(t)

(ii) cost cos5t + cos5t

On the same graph. Create legends in plots

PROGRAM

clc;

clear all;

close all;

t=-10:0.01:10;

y=cos(t);

plot(t,y,'k','linewidth',2)

hold on;

y=(cos(t).*cos(5*t))+cos(5*t);

plot(t,y,'r', 'linewidth',2)

hold on;

legend('cos(t)','cost cos5t + cos5t');

OUTPUT

Plot a random signal using stem plot

PROGRAM

clc;

clear all;

close all;

x = rand(1,10);

y= rand(1,10);

stem(x,y);

title('stem plot')

xlabel('x values');

ylabel('y values');

OUTPUT