# Update Matrix row and column number in real time (ControlP5)
**URL:** https://discourse.processing.org/t/update-matrix-row-and-column-number-in-real-time-controlp5/4232
**Category:** Libraries
**Created:** [October 7, 2018, 9:22pm UTC](https://discourse.processing.org/t/update-matrix-row-and-column-number-in-real-time-controlp5/4232 "2018-10-07T21:22:49Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@anon57009815](https://discourse.processing.org/u/anon57009815)
#### Post date: [October 7, 2018, 9:22pm UTC](https://discourse.processing.org/t/update-matrix-row-and-column-number-in-real-time-controlp5/4232/1 "2018-10-07T21:22:49Z")
CONTROLP5
Is there a way to update (change) row number and column number of a matrix in real time?
Resources -\> ControlP5 -\> Controllers -\> ControlP5Matrix
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### Author:  [@jb4x](https://discourse.processing.org/u/jb4x)
#### Post date: [October 8, 2018, 6:06am UTC](https://discourse.processing.org/t/update-matrix-row-and-column-number-in-real-time-controlp5/4232/2 "2018-10-08T06:06:06Z")
Hi luisArandas,
From the [controlP5 reference](http://www.sojamo.de/libraries/controlP5/reference/), it seems that you have this method that can do what you want:
```auto
public Matrix setGrid(int theCellX, int theCellY)
```
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### Author:  [@anon57009815](https://discourse.processing.org/u/anon57009815)
#### Post date: [October 8, 2018, 8:40am UTC](https://discourse.processing.org/t/update-matrix-row-and-column-number-in-real-time-controlp5/4232/3 "2018-10-08T08:40:18Z")
Hello jb4x, my question is can that be updated real time?
Let’s make an example I create a slider cp5.addSlider -\> and then in the function to get the event I would say get the value from the slider and override the variable that is for example cellX
`void public controlEvent(ControlEvent theEvent){ theCellX = (int)(theEvent.getController("newSlider").getValue()); }`
If I want to change the cells in real time (or columns) in accordance with a slider, how actually would I call that method?
Best, Luis
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### Author:  [@anon57009815](https://discourse.processing.org/u/anon57009815)
#### Post date: [October 8, 2018, 8:56am UTC](https://discourse.processing.org/t/update-matrix-row-and-column-number-in-real-time-controlp5/4232/4 "2018-10-08T08:56:57Z")
This is the way I am approaching -\> and it doesn’t work
