# symlog linear to log transition plot position?

Hi I need to use the symlog yscale in my graph, I have a lot of data that needs to be displayed linearly, with a small fraction at the upper end of the range that needs to be displayed in log scale due to its distance from the main data. The symlog scale works great, however I'd like to adjust the actual vertical graph position where it crosses from linear to log (not the threshold), because right now only ~25% of the y space is being given to linear, and I'd like it to be more like 80%. Is this possible?

Thanks!
David

Isn’t linthreshy what you are looking for? It denotes the range where the scale is linear. So, if it is 25, then from -25 to 25 the scale will be linear. After 25, it will be log.

Maybe I am missing something in your description?

Cheers!
Ben Root

···

On Tue, May 1, 2012 at 6:42 AM, David Erickson <derickso@…200…> wrote:

Hi I need to use the symlog yscale in my graph, I have a lot of data

that needs to be displayed linearly, with a small fraction at the upper

end of the range that needs to be displayed in log scale due to its

distance from the main data. The symlog scale works great, however I’d

like to adjust the actual vertical graph position where it crosses from

linear to log (not the threshold), because right now only ~25% of the y

space is being given to linear, and I’d like it to be more like 80%. Is

this possible?

Thanks!

David

Hi Ben,

``````No unfortunately linthreshy only controls the crossover point from
``````

linear to log scale, it does not give you control over where this
occurs on the figure’s y coordinates. I’ve attached a picture to
explain, currently the linear part of the graph is only being given
around 25% of the vertical space, I’d like to reverse that and give
linear ~75% and log at the top only the remaining 25%. Is this
possible? I’ve been digging around in the SymmetricalLogScale and
SymmetricalLogLocator classes and can’t even tell how this range is
allocated.

``````Thanks in advance!!

-David
`````` ···

On 5/1/2012 5:41 AM, Benjamin Root wrote:

``````    On Tue, May 1, 2012 at 6:42 AM, David > Erickson <derickso@...200...> >         wrote:
``````
``````      Hi I need to use the symlog yscale in my graph, I have a lot
``````

of data

``````      that needs to be displayed linearly, with a small fraction at
``````

the upper

``````      end of the range that needs to be displayed in log scale due
``````

to its

``````      distance from the main data.  The symlog scale works great,
``````

however I’d

``````      like to adjust the actual vertical graph position where it
``````

crosses from

``````      linear to log (not the threshold), because right now only ~25%
``````

of the y

``````      space is being given to linear, and I'd like it to be more
``````

like 80%. Is

``````      this possible?

Thanks!

David
``````
``````      Isn't linthreshy what you are looking for?  It denotes the
``````

range where the scale is linear. So, if it is 25, then from
-25 to 25 the scale will be linear. After 25, it will be log.

``````      Maybe I am missing something in your description?

Cheers!

Ben Root
``````

David,

Thanks, that is much clearer what you are looking for. You are right, I can’t seem to find any sort of obvious way to get what you want. Reading the docs for the SymLog scale indicates to me that the author intended for the logrithmic portion to be most interesting and the linear portion was only supposed to be a work-around the whole log(0) issue. Could you file an issue on the github page so that we can mark it as a feature request?

Thanks,
Ben Root

···

On Wed, May 2, 2012 at 3:59 PM, David Erickson <derickso@…200…> wrote:

On 5/1/2012 5:41 AM, Benjamin Root wrote:

``````    On Tue, May 1, 2012 at 6:42 AM, David > > Erickson <derickso@...200...> > >         wrote:
``````
``````      Hi I need to use the symlog yscale in my graph, I have a lot
``````

of data

``````      that needs to be displayed linearly, with a small fraction at
``````

the upper

``````      end of the range that needs to be displayed in log scale due
``````

to its

``````      distance from the main data.  The symlog scale works great,
``````

however I’d

``````      like to adjust the actual vertical graph position where it
``````

crosses from

``````      linear to log (not the threshold), because right now only ~25%
``````

of the y

``````      space is being given to linear, and I'd like it to be more
``````

like 80%. Is

``````      this possible?

Thanks!

David
``````
``````      Isn't linthreshy what you are looking for?  It denotes the
``````

range where the scale is linear. So, if it is 25, then from
-25 to 25 the scale will be linear. After 25, it will be log.

``````      Maybe I am missing something in your description?

Cheers!

Ben Root
``````

Hi Ben,

``````No unfortunately linthreshy only controls the crossover point from
``````

linear to log scale, it does not give you control over where this
occurs on the figure’s y coordinates. I’ve attached a picture to
explain, currently the linear part of the graph is only being given
around 25% of the vertical space, I’d like to reverse that and give
linear ~75% and log at the top only the remaining 25%. Is this
possible? I’ve been digging around in the SymmetricalLogScale and
SymmetricalLogLocator classes and can’t even tell how this range is
allocated.

``````Thanks in advance!!

-David
``````

Just getting to this after some unexpected absences. Yes – that is
how symlog was originally intended, so there isn’t currently any way
to configure it. Please file the issue and assign it to me. I’ll
have a look at what needs to be added to support this.

``````Mike
``````
···

On 05/03/2012 09:48 AM, Benjamin Root wrote:

``````    On Wed, May 2, 2012 at 3:59 PM, David > Erickson <derickso@...200...> >         wrote:
``````

On 5/1/2012 5:41 AM, Benjamin Root wrote:

``````                On Tue, May 1, 2012 at 6:42 > > > AM, David Erickson <derickso@...200...> > > >                     wrote:
``````
``````                  Hi I need to use the symlog yscale in my graph, I
``````

have a lot of data

``````                  that needs to be displayed linearly, with a small
``````

fraction at the upper

``````                  end of the range that needs to be displayed in log
``````

scale due to its

``````                  distance from the main data.  The symlog scale
``````

works great, however I’d

``````                  like to adjust the actual vertical graph position
``````

where it crosses from

``````                  linear to log (not the threshold), because right
``````

now only ~25% of the y

``````                  space is being given to linear, and I'd like it to
``````

be more like 80%. Is

``````                  this possible?

Thanks!

David
``````
``````                  Isn't linthreshy what you are looking for?  It
``````

denotes the range where the scale is linear. So,
if it is 25, then from -25 to 25 the scale will be
linear. After 25, it will be log.

``````                  Maybe I am missing something in your description?

Cheers!

Ben Root
``````

Hi Ben,

``````        No unfortunately linthreshy only controls the crossover
``````

point from linear to log scale, it does not give you control
over where this occurs on the figure’s y coordinates. I’ve
attached a picture to explain, currently the linear part of
the graph is only being given around 25% of the vertical
space, I’d like to reverse that and give linear ~75% and log
at the top only the remaining 25%. Is this possible? I’ve
been digging around in the SymmetricalLogScale and
SymmetricalLogLocator classes and can’t even tell how this
range is allocated.

``````        Thanks in advance!!

-David
``````
``````  David,

Thanks, that is much clearer what you are looking for.  You are
``````

right, I can’t seem to find any sort of obvious way to get what
you want. Reading the docs for the SymLog scale indicates to me
that the author intended for the logrithmic portion to be most
interesting and the linear portion was only supposed to be a
work-around the whole log(0) issue. Could you file an issue on
the github page so that we can mark it as a feature request?

Perfect, thanks Mike!

``````-David
``````
···

On 5/3/2012 7:01 AM, Michael Droettboom wrote:

On 05/03/2012 09:48 AM, Benjamin Root wrote:

``````      On Wed, May 2, 2012 at 3:59 PM, David > > Erickson <derickso@...200...> > >           wrote:
``````
``````              On 5/1/2012 5:41 AM, Benjamin Root > > > wrote:
``````
``````                  On Tue, May 1, 2012 at 6:42 > > > > AM, David Erickson <derickso@...200...> > > > >                       wrote:
``````
``````                    Hi I need to use the
``````

symlog yscale in my graph, I have a lot of data

``````                    that needs to be displayed linearly, with a
``````

small fraction at the upper

``````                    end of the range that needs to be displayed in
``````

log scale due to its

``````                    distance from the main data.  The symlog scale
``````

works great, however I’d

``````                    like to adjust the actual vertical graph
``````

position where it crosses from

``````                    linear to log (not the threshold), because right
``````

now only ~25% of the y

``````                    space is being given to linear, and I'd like it
``````

to be more like 80%. Is

``````                    this possible?

Thanks!

David
``````
``````                    Isn't linthreshy what you are looking for?  It
``````

denotes the range where the scale is linear.
So, if it is 25, then from -25 to 25 the scale
will be linear. After 25, it will be log.

``````                    Maybe I am missing something in your
``````

description?

``````                    Cheers!

Ben Root
``````

Hi Ben,

``````          No unfortunately linthreshy only controls the crossover
``````

point from linear to log scale, it does not give you
control over where this occurs on the figure’s y
coordinates. I’ve attached a picture to explain,
currently the linear part of the graph is only being given
around 25% of the vertical space, I’d like to reverse that
and give linear ~75% and log at the top only the remaining
25%. Is this possible? I’ve been digging around in the
SymmetricalLogScale and SymmetricalLogLocator classes and
can’t even tell how this range is allocated.

``````          Thanks in advance!!

-David
``````
``````    David,

Thanks, that is much clearer what you are looking for.  You are
``````

right, I can’t seem to find any sort of obvious way to get what
you want. Reading the docs for the SymLog scale indicates to me
that the author intended for the logrithmic portion to be most
interesting and the linear portion was only supposed to be a
work-around the whole log(0) issue. Could you file an issue on
the github page so that we can mark it as a feature request?

``````  Just getting to this after some unexpected absences.  Yes -- that
``````

is how symlog was originally intended, so there isn’t currently
any way to configure it. Please file the issue and assign it to
me. I’ll have a look at what needs to be added to support this.

``````  Mike
``````