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gzannis

Greece
2 Posts
Posted - 05/16/2002 :  03:29:25 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
I would like to plot some statistical data with the Y axis as LnLn(1/y). That means I have to make a totally custom Y axis. Is this possible in the Origin 6.0 ?

Jose

Netherlands
93 Posts
Posted - 05/16/2002 :  12:36:07 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I will plot y=x^2 in a Sqrt(y) y axis, as an example. In a case like this I use to

1. Plot the transformed data Sqrt(y) instead of y in a normal linear plot.

2. Remove the ticks and the tick labels of the y axis.

3. Draw my own ticks and labels "manually".

The idea for the last point is to use a dataset to draw horizontal ticks, using the Line plot type combined with the 2 Point Segment conection of the line properties. A similar idea is also explained in the Knowledge base.

I create my "axis-dataset" with alternating X values of X1 and X1+delta, being X1 the lower limit of my X axis and delta the tick lenght. Like this:

tickX
0
1
0
1
0
1
...


Then I add a Y column with the positions where I want my ticks, another Y column with their correspondant transformed values Sqrt(y), and a Label column with the labels I want to display (one for every data pair):

tickX   tickReal   tickY    tickLab
0         0        0
1         0        0          0
0         100      10
1         100      10         100
0         200      14.14
1         200      14.14      200
0         300      17.32
1         300      17.32      300
...


Then I include these data in the plot, using tickX as X, tickY as Y and tickLab as Label (this can be done easily with the Plot Associations). Then I

1. set the tickY plot type to Line, with the 2 Point Segment connection and 1.5 points thickness (to make it equal to the layer lines thickness), and

2. modify the tickLab label properties using Right justification, Attach to axis= Left Y, and X offset= -25.

This is the result:




Jose Via, Origin WebRing member


Edited by - Jose on 05/16/2002 13:03:40
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rtoomey

USA
184 Posts
Posted - 05/16/2002 :  3:21:24 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Great post Jose! You took the words right out of my mouth. Please note that there are two suggestions in our database:

  • QA 1567 - Wanted: User Defined Axis Scale Types (sqrt, sine, polynomial, K/X^N, exp(x))

  • QA 1568 - Wanted: Ability to Create Tick Marks and Labels by Dataset Values


Both of these items would vastly simplify this process. I have updated each of them with the information from this post. Thanks again to both of you for bringing this up.



Sincerely,
Ryan Toomey
OriginLab Technical Support
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