Difference between revisions of "Python-3.4.3/C2/Plotting-Data/English"

containing title, name of the production team along with the logo of MHRD

Objectives

• Define a list of numbers.
• Perform element-wise squaring of the list.
• Plot data points.
• Plot errorbars.

Ubuntu Linux 14.04

• Ubuntu Linux 14.04 operating system
• Python 3.4.3
• IPython 5.1.0

Pre-requisites

• run basic Python commands on the ipython console
• use Plots interactively
• Embellish a plot

If not, see the relevant Python tutorials on this website.

ipython3

Now, type ipython3 and press Enter.

%pylab and press Enter.

Type %pylab and press Enter.

Example - Simple Pendulum

For a simple pendulum L is directly proportional to the square of time T.

We will be plotting L and T square values.

Simple Pendulum Data

l = [0.1, 0.2, 0.3, 0.4, 0.5,0.6, 0.7, 0.8, 0.9]

t= [0.69, 0.90, 1.19,1.30, 1.47, 1.58, 1.77, 1.83, 1.94]

We initiate them as sequence of values. This is also called as List.

Type

l equal to within square brackets values and press Enter

t equal to within square brackets the values and press Enter

tsquare=square(t)

Type

tsquare=square within parentheses t and press Enter

tsquare and press Enter

array([ 0.4761, 0.81 , 1.4161, 1.69 , 2.1609, 2.4964, 3.1329,

3.3489, 3.7636])

plot(l,tsquare,'.')

plot within parentheses I comma tsquare comma within single quotes dot and press Enter

clf()

For this let us clear the plot first.

Type clf parentheses Enter

plot within parentheses I comma tsquare comma within single quotes o and press Enter

Exercise 1

Plot the given experimental data with large dots. The data is on your screen.

Exercise 1 data

delta_l= [0.08,0.09,0.07,0.05,0.06,0.00,0.06,0.06,0.01]

delta_t= [0.04,0.08,0.03,0.05,0.03,0.03,0.04,0.07,0.08]

Type delta underscore l equal to within square bracket the values and press Enter

delta underscore t within square bracket the values and press Enter

errorbar(l,tsquare,xerr=delta_l, yerr=delta_t, fmt='bo')

So type,

errorbar within parentheses I comma tsquare comma xerr equalto delta underscore I comma y underscore err equalto delta underscore t comma fmt equal to within single quotes bo

and press Enter

errorbar?

That is, errorbar question mark

Exercise 2

Plot the given experimental data with small dots.

Also include the error in your plot.

Exercise 2 data

Summary slide

1. Declare a list of numbers using the function array.

1. Perform element-wise squaring using the square function.
2. Use the various options available for plotting like dots, lines.
3. Plot experimental data such that we can also represent error by using the errorbar() function.

Evaluation

1. Square the following sequence.distance underscore values equal to within square brackets 2.1,4.6,8.72,9.03
2. Plot L versus T in red pluses.

Solutions

1.To square a sequence of values, we use the function square. So

square within parentheses distance underscore values

Answer to the second question

2. We pass an additional argument stating the desired parameter

plot within parentheses L comma T comma within single quotes r plus for red pluses

Forum

Fossee Forum

Textbook Companion

Acknowledgement

For more details, visit this website.

Thank You

Thank You