How to insert a variable into a text method of matplotlib

python matplotlib concatenation

11,302

Using % operator like the following line:

plt.text(a,z,'Sigmoid(%s)'%(a),fontdict=font)

11,302

JoeyBright

Hi, my full name is Javad PourMostafa (pronounced /’dʒævɒd puːr’moʊs’tae’fɑː/)! I go by joeybright or joyebright wherever I can get the username. I’m currently a postgraduate member at Guilan NLP Group and a part-time lecturer at the Computer Engineering Department of the University of Guilan. I graduated with an MS degree in Software Engineering from the same university in 2019. During the master thesis, I worked on designing sentiment analysis models using deep learning architectures for low-resources corpora (case-study: Persian). My research mainly centralizes on natural language processing and deep learning. I’m also interested in AI more broadly; as to non-academic affairs, I spend my time on Unix-like server maintenance.

Updated on June 04, 2022

Comments

JoeyBright almost 2 years

The following code represents two different functions, sigmoid(x), and logit(x). How it is possible to insert the dynamic labels, a and b into the plt.text() which derived from matplotlib.pyplot?

import math
import matplotlib.pyplot as plt

plt.ylabel("F(x)")
plt.xlabel("x")

a = 6
b = 0.9985

def sigmoid(x):
    return 1/(1+math.exp(-x))

#LOU jit
def logit (x):
    return math.log(x/(1-x))



z = sigmoid(a)
l = logit(b)

print(z)
print(l)

font = {
        'family': 'serif',
        'color' : 'green',
        'weight': 'normal',
        'size'  :  9
}
plt.plot([a,z],[b,l],'ro')
plt.text(a,z,'Sigmoid(a)',fontdict=font)
plt.text(b,l,'Logit(b)',fontdict=font)
plt.axis([0,10,0,50])

plt.grid(True)

plt.show()

Diziet Asahi over 6 years

Well done on finding the solution yourself! Just FYI, python has a new .format() paradigm which is more powerful than the old % one. See docs.python.org/3/library/string.html#string-formatting and pyformat.info
JoeyBright over 6 years

Tnq, I saw its relevant documentation!