| Author |
 Topic  |
|
|
juf2003
USA
Posts |
 Posted - 11/15/2004 : 4:27:26 PM
|
Origin Version (Select Help-->About Origin): origin 6.1
Operating System: Window XP
Hi,
I'm a new user of Origin 6.1 and
I want to fit a plot with this equation
y = P1 (1 + x/0.16) + 0.01
but I don't get any result. I don't find any mistake and I can't figure out what's going on. One of the message I got is
"Error, too few data points, or the data step is too big"
Thanks,
Julian |
|
|
easwar
USA
1965 Posts |
Posted - 11/15/2004 : 4:32:48 PM
|
Hi Julian,
If the data you are fitting with is small in size, please paste it here so we can try. Otherwise contact tech support directly with your data/OPJ.
Easwar
OriginLab
|
 |
|
|
juf2003
USA
Posts |
Posted - 11/15/2004 : 4:51:32 PM
|
Hi,
thanks for your prompt response.
Here you have my data
uM IC50
1.3 8.5
2.6 6.3
5.2 10.5
10.4 7.35
20.8 7
50 9.26
1000 13.5
5000 23.15
Thank you again
Julian |
|
|
|
easwar
USA
1965 Posts |
Posted - 11/15/2004 : 5:02:50 PM
|
Hi Julian,
I did not notice it the first time, but your function needs to be defined as:
y = P1 * (1 + x/0.16) + 0.01
(you had the * missing after the P1).
Also, in the function edit page of the NLSF tool, you need to set the Form drop-down list to either Y-Script or Equations (and not the default Expression) setting.
If I define the function as above, I can fit with your function and your data.
Easwar
OriginLab
|
|
|
|
juf2003
USA
Posts |
Posted - 11/15/2004 : 5:10:39 PM
|
Hi Easwar,
thank you so much.
Now, I was able to fit it.
Best,
Julian |
|
|
| |
Topic |
|
|
|
Fitting a plot w/ a user defined function