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# What is the logcombine function in Sympy

This recipe explains what is the logcombine function in Sympy

The logcombine function takes logarithms and combines them according to the following rules:

1. log (p) + log (q) = log (p * q) if both are positive

2. r * log (p) = log (p ** r) if p is positive and r is real

For more related projects -

https://www.dezyre.com/projects/data-science-projects/tensorflow-projects

https://www.dezyre.com/projects/data-science-projects/keras-deep-learning-projects

Example:

```
# Example 1:
```

# Importing libraries

from sympy import logcombine,pprint, log

from sympy.abc import p,q

# Defining some expression

expression=(log(p)+log(q))

# Printing expression

pprint(expression)

# logcombine function

logcombine(expression, force=True)

Output - log(p) + log(q) log(𝑝𝑞)

```
# Example 2:
```

# Importing libraries

from sympy import logcombine,pprint, log

from sympy.abc import p,q,r

# Defining some expression

expression=(r*log(p)+log(q))

# Printing expression

pprint(expression)

# logcombine function

pprint(logcombine(expression, force=True))

Output - r⋅log(p) + log(q) r log(p .q)

In this way, we can use the logcombine function in sympy.

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