Wolfram Function Repository
Instant-use add-on functions for the Wolfram Language
Function Repository Resource:
Integrate a rational function using partial fraction decomposition
ResourceFunction["IntegratePFD"][rat,x] gives the indefinite integral |
Perform a partial fraction decomposition:
| In[1]:= |
| Out[1]= | ![]() |
In this example we compute the partial fraction expansion
prior to computing the integral with Integrate:
| In[2]:= |

| Out[2]= | ![]() |
IntegratePFD gives different results than Integrate:
| In[3]:= | ![]() |
| Out[3]= |
| In[4]:= | ![]() |
| Out[4]= | ![]() |
Another example:
| In[5]:= | ![]() |
| Out[5]= |
| In[6]:= | ![]() |
| Out[6]= | ![]() |
By default this integral produced an ArcTan, as expected:
| In[7]:= |
| Out[7]= |
With the following extension we factor x2+1 into (x-I)(x+I) prior to computing the partial fraction decomposition:
| In[8]:= |
| Out[8]= |
Compute the integral over different algebraic number fields until you find a solution which matched your homework problem:
| In[9]:= |
| Out[9]= |
| In[10]:= |
| Out[10]= |
| In[11]:= |
| Out[11]= | ![]() |
| In[12]:= |
| Out[12]= | ![]() |
Integrate and IntegratePFD will both return valid antiderivatives, however the results will often look vastly different:
| In[13]:= | ![]() |
| Out[13]= |
| In[14]:= | ![]() |
| Out[14]= |
The two results are equivalent:
| In[15]:= |
| Out[15]= |
Sometimes Integrate will give a more concise answer than IntegratePFD:
| In[16]:= |
| Out[16]= |
| In[17]:= |
| Out[17]= |
IntegratePFD may be used to generate many alternative forms of an integral by factoring the denominator over different algebraic number fields:
| In[18]:= |
| Out[18]= |
| In[19]:= |
| Out[19]= | ![]() |
| In[20]:= |
| Out[20]= |
| In[21]:= |
| Out[21]= | ![]() |
| In[22]:= |
| Out[22]= | ![]() |
| In[23]:= |
| Out[23]= | ![]() |
| In[24]:= |
| Out[24]= | ![]() |
Wolfram Language 13.0 (December 2021) or above
This work is licensed under a Creative Commons Attribution 4.0 International License