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 Quick Question - Isotropic graphs		  New Topic  Reply to Topic
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greadey

UK
Posts
Posted - 02/26/2008 :  08:43:02 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5 pro
Operating System: Win XP

Just a (hopefully) quickie - is there an easy way to produce isotropic graph scales.

Cheers,

greadey

Deanna

China
Posts
Posted - 02/28/2008 :  04:42:36 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Sorry, I am not very sure about what you mean by "isotropic graph scales."

Would you please explain more or show me an example graph?

Deanna
OriginLab Technical Services
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greadey

UK
Posts
Posted - 02/28/2008 :  06:46:17 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Isotropic graph scales produce a perfectly square graph, I am interested since I do alot of electrochemical impedance spectroscopy and isotropic graphs do not distort the semi-circles you obtain with EIS.

Hope this helps :-)

greadey
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larry_lan

China
Posts
Posted - 02/28/2008 :  9:24:53 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Greadey:

Sorry, we are not familiar to your field. May be "Plot : Multi-Curve : Stack" is what you need?

Could you please provide some sample data and show us an example?

Thanks
Larry
OriginLab Technical Services
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greadey

UK
Posts
Posted - 02/29/2008 :  07:19:32 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Ok, Here is a data set. In the package that produced it you can select "isotropic scaling" to display a perfect semi-circle. This is needed so that you can spot "distorted" semi-circles. If you plot this in origin is distorts the semi-circle. Hope this helps explain things.

greadey

A B
1 -1.59E-04
1 -1.96E-04
1 -2.41E-04
1 -2.96E-04
1 -3.65E-04
1 -4.49E-04
1 -5.52E-04
1 -6.79E-04
1 -8.35E-04
1 -0.00103
1 -0.00126
1 -0.00156
1 -0.00191
1 -0.00235
1 -0.0029
1 -0.00356
1 -0.00438
1.0001 -0.00539
1.0001 -0.00663
1.0001 -0.00816
1.0002 -0.01004
1.0003 -0.01235
1.0005 -0.01519
1.0007 -0.01867
1.0011 -0.02296
1.0016 -0.02821
1.0024 -0.03465
1.0036 -0.04253
1.0055 -0.05212
1.0083 -0.06376
1.0124 -0.07779
1.0185 -0.09449
1.0275 -0.11408
1.0405 -0.13649
1.0589 -0.1612
1.0841 -0.18701
1.1171 -0.21178
1.1583 -0.23256
1.2061 -0.24611
1.2574 -0.24989
1.3081 -0.24315
1.3542 -0.22723
1.3931 -0.20497
1.4239 -0.17963
1.447 -0.15397
1.4637 -0.12982
1.4754 -0.10819
1.4835 -0.08944
1.4889 -0.07352
1.4926 -0.06021
1.4951 -0.04919
1.4968 -0.04011
1.4979 -0.03268
1.4986 -0.0266
1.4991 -0.02164
1.4994 -0.0176
1.4996 -0.01431
1.4997 -0.01164
1.4998 -0.00946
1.4999 -0.00769
1.4999 -0.00625
1.4999 -0.00508
1.5 -0.00413
1.5 -0.00336
1.5 -0.00273
1.5 -0.00222
1.5 -0.0018
1.5 -0.00147
1.5 -0.00119
1.5 -9.69E-04
1.5 -7.87E-04
1.5 -6.40E-04
1.5 -5.20E-04
1.5 -4.23E-04
1.5 -3.44E-04
1.5 -2.79E-04
1.5 -2.27E-04
1.5 -1.85E-04
1.5 -1.50E-04
1.5 -1.22E-04
1.5 -9.91E-05
1.5 -8.06E-05
1.5 -6.55E-05
1.5 -5.32E-05
1.5 -4.33E-05
1.5 -3.52E-05
1.5 -2.86E-05
1.5 -2.32E-05
1.5 -1.89E-05
1.5 -1.54E-05
1.5 -1.25E-05
1.5 -1.01E-05
1.5 -8.24E-06
1.5 -6.70E-06
1.5 -5.45E-06
1.5 -4.43E-06
1.5 -3.60E-06
1.5 -2.93E-06
1.5 -2.38E-06
1.5 -1.93E-06
1.5 -1.57E-06
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greg

USA
1380 Posts
Posted - 03/04/2008 :  11:55:24 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I think what you are asking for is to have the x and y axis have the same physical scale. This script should do the trick :

// BEGIN SCRIPT
temp=layer.unit;
layer.unit=2;
dx = x2 - x1;
dy = y2 - y1;
if(dx > dy)
{
layer.height = layer.width * dy / dx;
}
else
{
layer.width = layer.height * dx / dy;;
}
layer.unit=temp;
// END SCRIPT
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greadey

UK
Posts
Posted - 03/04/2008 :  12:31:38 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Lovely jubbly,

works a treat,

Thanks ever so much Greg,

greadey
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