# Indirection on Easy Chart **URL:** \ **Category:** Ignition\ **Created:** [September 28, 2012, 5:44pm UTC](https://forum.inductiveautomation.com/t/indirection-on-easy-chart/5214 "2012-09-28T17:44:37Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Bob](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bob/32/16899_2.png) [@Bob](https://forum.inductiveautomation.com/u/Bob)\ **Post date:** [September 28, 2012, 5:44pm UTC](https://forum.inductiveautomation.com/t/indirection-on-easy-chart/5214/1 "2012-09-28T17:44:37Z")
I was trying to do indirection using an Easy Chart since it appear sto be possible, yet I was getting errors with this. After looking through the forum, it seemed that indirection is not really possible with an Easy Chart, an instead it is recommended to use a Classic Chart. I have switched to using a Classic Chart and indirection is working fine, but I do miss some things that were available in the Easy Chart such as Chart Mode and the easy checkbox type of Pen Control selection. I am also looking for a way to dynamically change the linear/logarithmic scale of the axes via script with the Classic Chart. I was doing this with the Easy Chart. First is it true that indirection is not recommended/possible with the Easy Chart? And if so, is there a plan to support indirection with the Easy Chart in the future? Thanks, Bob ---
**Author:** ![Michael.Stofan](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michael.stofan/32/3342_2.png) [@Michael.Stofan](https://forum.inductiveautomation.com/u/Michael.Stofan)\ **Post date:** [September 28, 2012, 8:10pm UTC](https://forum.inductiveautomation.com/t/indirection-on-easy-chart/5214/2 "2012-09-28T20:10:47Z")
What part of the Easy Chart were you trying to make dynamic (through indirection)? If it’s pens or axes you’re trying to change at-will, you can usually do that pretty easily. Also, what version of Ignition are you running? Or is this FPMI? ---
**Author:** ![Bob](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bob/32/16899_2.png) [@Bob](https://forum.inductiveautomation.com/u/Bob)\ **Post date:** [October 1, 2012, 6:07pm UTC](https://forum.inductiveautomation.com/t/indirection-on-easy-chart/5214/3 "2012-10-01T18:07:15Z")
I am trying to change the pens with no luck. I am using Ignition 7.5.1. If I drag and drop tags on the Easy Chart it works fine. But if I try to bind the same tags using “Indirect Tag”, I get the error message “Cannot coerce value ‘5.7’ into type: interface com.inductiveautomation.ignition.common.Dataset”. When I get this error I must exit the project without saving to get rid of the error. Removing the binding does not get rid of the error. If I try to bind using “Tag History”, which works fine with a Classic Chart, I get many pens created ( I should get only two pens) and no values are plotted. I use Realtime with a 10 minute range, just as I do with the Classic Chart. ---
**Author:** ![James.Lorenz](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/james.lorenz/32/3290_2.png) [@James.Lorenz](https://forum.inductiveautomation.com/u/James.Lorenz)\ **Post date:** [October 1, 2012, 10:23pm UTC](https://forum.inductiveautomation.com/t/indirection-on-easy-chart/5214/4 "2012-10-01T22:23:38Z")
Those pens work differently than the “data” property of a classic chart. Those pens hold specific metadata about how the tag is displayed on the chart, and what the tag\_path for that tag is. It doesn’t hold the actual stored data for a tag. To achieve indirection, you will use the cell update binding to modify the tag\_path of a pen in realtime. The IA youtube channel has a video that shows how to do this: [youtube.com/watch?v=NxVKA3fNsnM](http://www.youtube.com/watch?v=NxVKA3fNsnM)