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MathGroup Archive 2001

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Re: tickmark problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30415] Re: [mg30393] tickmark problem
  • From: BobHanlon at aol.com
  • Date: Fri, 17 Aug 2001 03:09:54 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 2001/8/15 1:16:57 AM, bernd at bio.vu.nl writes:

>I am having some difficulties with the TickMarks. For a publishable
>graph, a set tickmarks and use a frame.
>However Mathematica sometimes changes the major ticks marks to the
>length of the minor ticks.  Then i thought to set the lenghts
>explicitly, but the following puzzles me (tickmark position are a bit
>strange but they illustrate the problem).
>
>p = Plot[t t  , {t, 0, tend}, Frame -> True, PlotRange -> {0, 11}, 
>    FrameTicks -> {Range[0, 10, 2], {0.001, 0.01, 0.1, 1, 10}, None, None}
>]
>
>p = Plot[t t  , {t, 0, tend}, Frame -> True, PlotRange -> {0, 11}, 
>    FrameTicks -> {Range[0, 10, 2], {0.01, 0.1, 1, 10}, None, None} ]
>    
>FrameTicks /. AbsoluteOptions[p]
>
>gives for all tickmarks {0.00625, 0.} as length specification for both
>graphs.  However, you can clearly see the tickmarks length decrease
>when FrameTicks includes 0.001.
>    FrameTicks -> {Range[0, 10, 2], {0.001, 0.01, 0.1, 1, 10}, None, None}
>
>    instead of
>    FrameTicks -> {Range[0, 10, 2], {0.01, 0.1, 1, 10}, None, None} 
>   
>How can i make sure the tickmarks ALWAYS have the same length
>regardless of PlotRange and tickmark positions?
>And why does Mathematica give the same tickmark lengths when we can cleary
>see the lengths on the hor. axis change?
>

You have specified tick locations without specifying the tick lengths so the 
default length is used.

p = Plot[x, {x, 0, 10}, Frame -> True];

A major tick specification looks like

(FrameTicks /. AbsoluteOptions[p])[[1,1]]

{0., 0., {0.00625, 0.}, {GrayLevel[0.], 
   AbsoluteThickness[0.25]}}

A minor tick specification looks like

(FrameTicks /. AbsoluteOptions[p])[[1,8]]

{1., "", {0.00375, 0.}, {GrayLevel[0.], 
   AbsoluteThickness[0.125]}}

majorTicks = 
    Table[{x, x, {0.00625, 0.}, {GrayLevel[0.], AbsoluteThickness[0.25]}}, 
      {x, 0, 10, 3}];

minorTicks = 
    Table[{x, "", {0.00375, 0.}, {GrayLevel[0.], AbsoluteThickness[0.125]}}, 
      {x, 0, 10, 1/2}];

p = Plot[x, {x, 0, 10}, Frame \[Rule] True, 
      FrameTicks -> {
          Join[majorTicks, minorTicks], Automatic, None, None}];


Bob Hanlon
Chantilly, VA  USA


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