Support Board
Date/Time: Wed, 17 Sep 2025 04:22:38 +0000
Linear/Log Lines on Linear/Log scaling
View Count: 883
| [2022-05-10 11:54:00] |
| FuturesBod - Posts: 18 |
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I'm wary of opening up this can of worms but bear with me! On SC if you draw a line/ray on a linear scale and convert the scale to log, the line bends. This is mathmatically correct - every point on the line has a linear relationship to the other points on the line. Thus where it crosses a bar will be the same no matter if using linear or log scale. While there is the option to draw a 'straight' line on the log chart, it appears to be a bit of a fudge in that its not actually a logarithmic line, but a linear line that's been extended. Would it be possible to add a logarithmic calculated line to the suite of tools, this would draw curved line on a linear chart and straight on a logarithmic chart? Mathmatically this would seem to be correct and would make SC the only product (I know of) to actually do both of these tasks correctly! (I'd need to do the sums but I think this might open the door to logarithmic pitchforks and probably other sloping drawing tools too). Thanks. |
| [2022-05-10 11:56:59] |
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What is the exact name of the Drawing Tool you are using and we will check how this is implemented.
Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing Date Time Of Last Edit: 2022-05-10 11:57:08
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| [2022-05-10 12:00:03] |
| FuturesBod - Posts: 18 |
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The basic 'Line' and the 'Ray'. Thx. |
| [2022-05-29 21:30:33] |
| FuturesBod - Posts: 18 |
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*bump* Apologies, please say if bumping this is inappropriate. Log lines are something that would be helpful to quite a few people I think and would perhaps open the door to log channels, log pitchforks and any other diagonal line based drawing tools. So just didn't want this to get lost in the noise. Sincere thanks. Date Time Of Last Edit: 2022-05-30 22:55:23
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| [2022-06-19 09:12:30] |
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Refer to the updated documentation here: Chart Drawing Tools: Line, Ray, Extended Line Refer to the updated Description section. There are paragraphs added for a logarithmic scale and how these drawings work on those types of scales. We apologize for the delay. Sometimes when we ask for information, it can be a substantial amount of time later when we are able to do work on this. We have done that now and updated the documentation for how these drawings work on a logarithmic scale. The Pitchfork drawing tool does also work correctly on a logarithmic scale. Not sure about other channel lines. We have given your account a new trial, if you want to try Sierra Chart again. Going back to your original post: Would it be possible to add a logarithmic calculated line to the suite of tools, this would draw curved line on a linear chart and straight on a logarithmic chart? No, this is not something we would add support for.
Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing Date Time Of Last Edit: 2022-06-19 09:17:30
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| [2022-06-20 15:54:59] |
| FuturesBod - Posts: 18 |
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We have given your account a new trial, if you want to try Sierra Chart again.
Firstly thanks for this, very much appreciated.The Pitchfork drawing tool does also work correctly on a logarithmic scale.
I think there may be misunderstanding...Currently, lines, rays, forks etc. all draw with a linear relationship. Thus when they draw on a log chart they are all curved - this is correct IF those lines are drawn with linear relationship between the user specified points (let's call them A & B). However, if those lines are drawn with a logarithmic relationship between A and B there would be two important differences: - when moving the line on the chart the lines would stay at the same angle not matter if they are moved up or down because the relationship between A and B remains logarithmic. - on forks/channels the lines would remain logarithmically (and visually) parallel rather than linearly parallel. Ticking the box to draw straight lines on log charts is not a mathmatically correct solution because the relationship between point A and B is measured linearly (rather than logarithmically) so if the line is moved the angle of the line will change too. Moreover, on channels and forks the gap between the lines narrows as it gets higher because its being measured linearly but implies a 10c gap between lines when a stock is $10 is the same as a 10c gap when that stock has risen to $200. I'm absolutely not saying the current drawing is wrong, it is exactly correct for a linear relationship between the points. The request is for the option to have that relationship be logarithmic and that be available on lines, rays, forks etc. Fingers crossed for a favourable outcome! |
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