# Using a complex numbers library -- Apache math
**URL:** https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771
**Category:** Libraries
**Created:** [June 2, 2019, 9:23am UTC](https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771 "2019-06-02T09:23:47Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@toby](https://discourse.processing.org/u/toby)
#### Post date: [June 2, 2019, 9:23am UTC](https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771/1 "2019-06-02T09:23:47Z")
Hello all, I’m working on a sketch for generating fractals and would like to replace my hand-rolled complex math functions with a “proper” library 🙂
I’ve downloaded the jar for Adobe Commons Math to “sketchbook home”/libraries/acm/library/ but I can’t see how to import the library. I’d appreciate any tips. Thanks!
Toby
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### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [June 2, 2019, 10:49am UTC](https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771/2 "2019-06-02T10:49:06Z")
It sounds weird:
Drag the jar file on the source code of your sketch in processing and drop it there
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### Author:  [@raron](https://discourse.processing.org/u/raron)
#### Post date: [June 2, 2019, 10:49am UTC](https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771/3 "2019-06-02T10:49:48Z")
Apache [Commons Math](https://commons.apache.org/proper/commons-math/index.html). I guess this is the one you mean (links are always nice).
I’m no expert, but tried to install this just now and it worked. It’s explained how here:
[How to Install a Contributed Library](https://github.com/processing/processing/wiki/How-to-Install-a-Contributed-Library).
Look at the bottom on how to install non-Processing libraries. I did as suggested, except I called the folder “ApacheCommonsMath”, renamed the “commons-math3-3.6.1.jar” file to the same name, made a sub-folder named “library” and put it there.
Then started the Processing IDE and selected menu: Sketch - Import library - ApacheCommonsMath.
There was a long list of imports, but probably not all are neccessary, depending on what you use.
If there are examples included with the library, I don’t know how to get those installed. I made a quick test from the statistics page:
```auto
/** Apache Commons Math test
https://commons.apache.org/proper/commons-math/userguide/stat.html
*/
import org.apache.commons.math3.stat.descriptive.*;
float[] inputArray = new float[10];
for ( int i=0; i<10; i++) {
inputArray[i] = (float) i;
}
// Get a DescriptiveStatistics instance
DescriptiveStatistics stats = new DescriptiveStatistics();
// Add the data from the array
for ( int i = 0; i < inputArray.length; i++) {
stats.addValue(inputArray[i]);
}
// Compute some statistics
double mean = stats.getMean();
double std = stats.getStandardDeviation();
double median = stats.getPercentile(50);
println(mean);
println(std);
println(median);
exit();
```
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### Author:  [@toby](https://discourse.processing.org/u/toby)
#### Post date: [June 2, 2019, 6:07pm UTC](https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771/4 "2019-06-02T18:07:57Z")
Thanks a lot Chrisir! Your suggestion worked, and it auto-created a folder called ‘code’ in my sketch’s folder.
best!
Toby
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### Author:  [@toby](https://discourse.processing.org/u/toby)
#### Post date: [June 2, 2019, 6:10pm UTC](https://discourse.processing.org/t/using-a-complex-numbers-library-apache-math/11771/5 "2019-06-02T18:10:02Z")
Thanks a million raron. I should have read [How to Install a Contributed Library](https://github.com/processing/processing/wiki/How-to-Install-a-Contributed-Library) myself, so apologies for that. Your solution was perfect and I am mathing away! best, Toby.