How to use semi-log cycle graph paper ?

Debate and discussion of any biological questions not pertaining to a particular topic.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
Nicolodn
Garter
Garter
Posts: 31
Joined: Sun Sep 12, 2010 10:09 am

How to use semi-log cycle graph paper ?

Post by Nicolodn » Sat Oct 09, 2010 11:38 am

If on the y-axis they have 1,2,3, etc..and then it goes 1,2,3 etc up to 10 again.
If I have data that I need to plot on the y-axis are 0.160, 0.255 ,etc
Do I change the 1,2,3 into 0.1,0.2? or do I just leave it?
Also, do I need to label the axis as being in semi-log?

Thank you.

User avatar
JackBean
Inland Taipan
Inland Taipan
Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Post by JackBean » Mon Oct 11, 2010 8:53 am

axis is either log or normal. The graph is semi-log, if one of axis is in log and the other not.

I'm not much sure, what you mean with your first sentence.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

Nicolodn
Garter
Garter
Posts: 31
Joined: Sun Sep 12, 2010 10:09 am

Re: How to use semi-log cycle graph paper ?

Post by Nicolodn » Thu Oct 14, 2010 1:01 pm

On the graph paper, it has printed on it 1, 2, 3,4,5,6,7,8,9, and then 1,2,3,4,5,6,7,8,9,1 again going up the y-axis.

But my data is absorbance readings of 0.255, 0.331, etc . So I'm wondering, do I have to change those numbers to 0.1, 0.2 on the y-axis or just leave it since it is a semi-log graph.

I just realised I posted a new topic with the same question-------
Q. if my data is 0.1 do I mark it on the '1' for y-axis or am I mean to find out 0.1 = log Z and mark the Z number on the y-axis?

Thank YOu.

User avatar
canalon
Inland Taipan
Inland Taipan
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Location: Canada

Post by canalon » Thu Oct 14, 2010 8:33 pm

time would be on the x (linear) axis and OD expressed as power of 10 on the y-axis
so you would have to put 2.55x10^-1, 3.331x10^-1 and since each module (from 1 to 9.99) represent 1 power of 10 (your choice) you can just say that the first module of the y-axis is the 10^-1 module and go with that.
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

Post Reply

Who is online

Users browsing this forum: No registered users and 13 guests