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Inconsistent axis rescaling


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Hi

I have encountered a strange problem and any points to its resolution will

be gratefully appreciated.

I have auto scale of chart fx client server on

for one chart I set data to the chart and get the following max and min just

before and after the closedata method:

Before:

Max: 179155.827392191

Min: -8887.94238969404

After:

Max: 200000

Min: -100000

For another set of data I get

Before:

Max: 162577.227222706

Min: -5637.20400744025

After:

Max: 170000

Min: -10000

Why doesn't the first min round to -10 000 but to -100 000 unlike the second

chart?

thanks

--

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Paul Nailand

Visual Risk Pty Ltd

www.visualrisk.com

+61 (2) 9388 1370

+61 (0) 413 002 802

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I took me some time to realize what was happening here, I first though it

was a bug but this turned out to be false. Here is what's happening:

To determine de magnitude of your scale we take

log(Max-Min)

This us the number of digits of your range, we then round your Min and Max

to a multiple of this power of ten.

However, we have a limit, if the change represents more than 10% of the

scale, we round to the immediately lower power of 10.

For the data you are mentioning:

log(Max-Min) = 5

Therefore Chart FX is going to try to round to a multiple of 100,000,

however, for the second set of data (-5637.20400744025 to 162577.227222706),

since it is smaller, the 10% condition kicks in and therefore the Min and

Max are now rounded to 10,000.

So although it looks weird, it is doing it right, the reason for the 10%

condition is to prevent the scale from growing to a point where there is too

much unused space.

--

FP

Software FX, Inc.

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Hi

what does 10% of the scale mean. is there a default number of steps that

chartfx tries to create if step has not been set

thanks

Paul

> I took me some time to realize what was happening here, I first though it

> was a bug but this turned out to be false. Here is what's happening:

>

> To determine de magnitude of your scale we take

>

> log(Max-Min)

>

> This us the number of digits of your range, we then round your Min and Max

> to a multiple of this power of ten.

>

> However, we have a limit, if the change represents more than 10% of the

> scale, we round to the immediately lower power of 10.

>

> For the data you are mentioning:

>

> log(Max-Min) = 5

>

> Therefore Chart FX is going to try to round to a multiple of 100,000,

> however, for the second set of data (-5637.20400744025 to

162577.227222706),

> since it is smaller, the 10% condition kicks in and therefore the Min and

> Max are now rounded to 10,000.

>

> So although it looks weird, it is doing it right, the reason for the 10%

> condition is to prevent the scale from growing to a point where there is

too

> much unused space.

>

> --

> FP

> Software FX, Inc.

>

>

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