OmniTrader Archives
OmniTrader 2012 Technical Support
Volume Scaling Problem
15 replies, 3195 viewings
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OmniTrader Archives
OmniTrader 2012 Technical Support
Volume Scaling Problem
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Last Activity 3/18/2022 1:29 PM 15 replies, 3195 viewings |
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Vinay Elite    Posts: 640 Joined: 12/9/2011 Location: Planet Earth  User Profile |
[Edited by Vinay on 3/28/2012 8:26 AM]  Attached file : Volume Scale.jpg (149KB - 920 downloads) | ||
| Jim Dean Sage   Posts: 3022 Joined: 9/21/2006 Location: L'ville, GA User Profile |
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| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
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| Jim Dean Sage Posts: 3022 Joined: 9/21/2006 Location: L'ville, GA User Profile |
This happens since OT optimizes the use of vertical space based on the currently-displayed min and max of each indicator, independently. That's a good thing for indic's on a dedicated pane, but messes things up for situations like yours. This usually can be solved simply using OLang, by creating a custom indicator which simply plots the two canned indicators together. There have been many feature requests over the years for OT to be given mor intelligence re plotting multiple indic's manually on a common screen. | ||
| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
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| Barry Cohen Sage  Posts: 6338 Joined: 1/19/2004 User Profile |
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| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
Originally written by 291234 on 2/13/2012 9:00 PM This is one of those requests that I keep pushing for. Barry ... Will you be kind enough to try once more to get this done? Thanks. [Edited by Vinay on 5/1/2013 10:33 AM] | ||
| wolf Veteran Posts: 159 Joined: 4/16/2011 Location: Germany User Profile |
regards wolfgang | ||
| Barry Cohen Sage Posts: 6338 Joined: 1/19/2004 User Profile |
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| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
Originally written by Jim Dean on 2/12/2012 6:06 PM Unfortunately OT has a weakness when it comes to plotting multiple indicators on the same chart. If the two+ indicators have the same bounded scale, like STOC or RSI, then it works fine. But if either indicator has an unbounded scale (ie flexible max &/or min), then the scale for the two will not be the same. See the overlapping different values on the right of your pic. This happens since OT optimizes the use of vertical space based on the currently-displayed min and max of each indicator, independently. That's a good thing for indic's on a dedicated pane, but messes things up for situations like yours. This usually can be solved simply using OLang, by creating a custom indicator which simply plots the two canned indicators together. There have been many feature requests over the years for OT to be given mor intelligence re plotting multiple indic's manually on a common screen. Jim, will you be kind enough to code it for me. I want VMA to be plotted over VHI Indicator with ability to modify the parameters. Thanks in advance. | ||
| Jim Dean Sage Posts: 3022 Joined: 9/21/2006 Location: L'ville, GA User Profile |
Save code below as an OLang Indic and compile it. Manually create chart with the VHI indicator showing in a pane Add the OLang indicator aJDndVolMA to that same pane. ... note ... VHI is a special case ... normally you'd plot it from within the custom indicator, but it is a pain to recreate the color-shading of the VHI from within OLang, so I just took a shortcut here. #Indicator '*************************************************************************+ ' aJDndVolMA by Jim Dean, 14jan14 ' ' Plots VMA on the same scale as V (or VHI which = V) ' To see VHI colors, plot VHI manually on the same pane as this indicator '*************************************************************************+ #param "VMAperiods", 10 dim VolMA, Lo, Hi as double ' uses double to preserve precision VolMA = SMA(V,VMAperiods) ' uses Simple MA since not specified Lo = math.min(VolMA,V) Hi = math.max(VolMA,V) setscales(Lo,Hi) plot("VolMA", VolMA, orange) return VolMA | ||
| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
[Edited by Vinay on 1/14/2014 6:22 AM] | ||
| Jim Dean Sage Posts: 3022 Joined: 9/21/2006 Location: L'ville, GA User Profile |
This is an example for folks who don't own OT Pro (yet) of how easy it is to do stuff that is outside the scope of native OT capabilities. OT Pro is the best upgrade for your money to the base OT package, since it offers literally infinite possibilities. This code is a good "template" for combining other things too. The trick is the Lo/Hi/SetScales stuff. Just set up param's to match those for the desired indicators, define a variable to hold the indicator values (like VolMA), calc the values using internal OT function calls, and plot the results (one plot statement per indicator). This example does not plot V since I presumed that you wanted to see the pretty VHI colors. Note - if you try to overlay two indic's on the same scale, make sure their individual scale are "compatible". The routine will automatically display the range as the lowest low to the highest high amongst the two you calc. [Edited by Jim Dean on 1/14/2014 6:30 AM] | ||
| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
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| Jim Dean Sage Posts: 3022 Joined: 9/21/2006 Location: L'ville, GA User Profile |
So, if you want the Indicator to plot "V", WITHOUT THE PRETTY VHI COLORS, just add the line: plothist("Volume",V,0,blue,2) right before the other plot command. BUT, if you want all the VHI colors or something like that to apply to the Volume Histo, that's something more involved ... very doable ... contact me by email about it ... hvacsage at yahoo.com | ||
| Vinay Elite Posts: 640 Joined: 12/9/2011 Location: Planet Earth User Profile |
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