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I want to increase the number of minor ticks in a plot, but I don't want to label them. I searched through this site and also Mathematica documentation, but I didn't find any solution yet. Could anyone please tell me how to do this.

For an example:

Plot[2*Sin[x], {x, 0, 10}, Frame -> True, 
 FrameTicks -> {True, True, False, False}, Axes -> True, 
 AxesOrigin -> {0, 0}]

I want to get 10 minor tick marks in between 0 and 1 and so on (in between major tick marks on both axis).

Here is the output plot

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2 Answers 2

up vote 4 down vote accepted

Here's another approach, very similar to swish's. The difference being that it should work on all sorts of plot ranges.

The idea is to define a ticks function with min_ and max_ (idea from Ticks in documentation):

ticks[min_, max_] := 
  Table[If[FractionalPart[i] == 0., {i, i, .06, Red}, {i, "", .02,Blue}], 
  {i, Floor[min], Ceiling[max], 0.1}]

Then the graph:

Plot[2*Sin[x], {x, -\[Pi], \[Pi]}, Frame -> True, 
  FrameTicks -> {ticks, ticks, False, False}, Axes -> True]

and we get:

enter image description here

we note that we could use any condition within the Table in ticks (e.g. use Switch or Which to get mid-ticks, etc.

Also, here is a version that let's the user specify ranges of noteworthy ticks directly:

r1 = Range[-3, 3, 0.2];

r2 = Range[-3, 3, 0.1];

tickfreq = 0.05;

ticks[min_, max_] := 
 Table[With[{val = Round[Abs@FractionalPart[i], 0.01]}, 
   Which[Chop[Min[Abs[r1 - val]]] == 0, {i, i, .06, Red}, 
    Chop[Min[Abs[r2 - val]]] == 0, {i, "", .04, Green}, 
    1 < 2, {i, "", .02, Blue}]], {i, Floor[min], Ceiling[max], 
   tickfreq}]

where tickfreq specifies the frequency of the blue (base-) ticks, r1 the red ticks (with labels), r2 the green additional ticks. Using then the PlotRange you specify in the comments, we get:

Plot[2*Sin[x], {x, -\[Pi], \[Pi]}, Frame -> True, 
 FrameTicks -> {ticks, ticks, False, False}, Axes -> True, 
 PlotRange -> {{-0.5, 3.5}, {-0.25, 0.3}}]

enter image description here

Alternatively, one could also use different ticks version for the axes, but I am sure you get the idea. I hope this helps.

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Thanks a lot. I actually want to increase the height of minor ticks at middle of each major tick marks too.(minor ticks at -2.5,-1.5,-0.5,0.5,..)Could you please tell me how to do it? –  TMH Apr 30 '13 at 18:05
    
Thanks a lot Pinguin. –  TMH Apr 30 '13 at 18:20
    
If my plot range is PlotRange -> {{-0.5, 3.5}, {-0.25, 0.3}}Can I still use FractionalPart[i]? I just want to show integers in x axis, but I want to get y axis as -0.25,-0.15,-0.05,0.05,0.15,0.25. I tried to get this, but I still couldn't get it. Could you please tell me how to get it? –  TMH Apr 30 '13 at 20:03
    
I tried with this, ticks[min_, max_] := Table[Switch[Abs@FractionalPart[i*10], 0.5, {i, i, .06, Red}, 0., {i, i, .04, Green}, _, {i, "", .02, Blue}], {i, Floor[min], Ceiling[max], 0.01}] Plot[2*Sin[x], {x, -\[Pi], \[Pi]}, Frame -> True, FrameTicks -> {Automatic, ticks, False, False}, PlotRange -> {{-0.5, 3.5}, {-0.25, 0.3}}, Axes -> True] But, I still couldn't get the expected output. –  TMH Apr 30 '13 at 21:02
    
I am sorry for all the edits, the numerical values caused me some problems. I am using Chop now in a version that let's you specify r1 (red ticks, labeled) and r2 (green ticks), rest is blue ticks. I hope you are able to finally do your chart - good luck, I have to run! –  Pinguin Dirk Apr 30 '13 at 22:40

You can always manually specify the ticks with its labels, size and style

ticks = ({#, "", {.01, .005}, Red} & /@ Range[0.1, .9, .1])~Join~Range[0, 10, 1]
Plot[2*Sin[x], {x, 0, 10}, Frame -> True, 
 FrameTicks -> {ticks, True, False, False}, Axes -> True, 
 AxesOrigin -> {0, 0}]
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Thanks for the comment. Can I increase the height of ticks at 0.5,1,1.5,2,...and so on? –  TMH Apr 30 '13 at 17:00
    
FindDivisions[] would be a very handy function here... –  J. M. Apr 30 '13 at 17:05
    
@swish Thanks. I actually want sub ticks for all range and to increase the height of tick marks which are located at 0,0.5,1,1.5 and 2. (I don't want to increase the height of all ticks) How to edit the above code for that purpose? –  TMH Apr 30 '13 at 17:16
    
@J.M. Thanks for the comment. But, I don't know how to use it for my problem. –  TMH Apr 30 '13 at 17:17
1  
@TMH You can make it yourself, just specify the list of ticks you want {tick1, tick2, ...} with tickN of format {position, label, {positive_size, negative_size}, style}. –  swish Apr 30 '13 at 17:24

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