On Tue, 30 Nov 2004 20:20:37 -0000, "Oddjob"
wrote:

"Don Pearce" wrote in message
...
On Tue, 30 Nov 2004 20:01:56 -0000, "Oddjob"
wrote:

Nice graph Jim :-)

The labelling of your x y axis would be better (mathematically correct) by
using / instead of ( )

Current / mA instead of Current (mA)

Oddjob ;-)


I've never bought this theory - that the axis of a graph is the other
side of an equation. As far as I am concerned the graph axis is the
current in milliamps - not one-over-milliamps (or current per milliamp
as you have it, which is dimensionless).

So it is Current (mA) - a good label
Not Current / mA - an incorrect representation of what is on the
graph.

But the axis is the description of the quantity on the graph, so that:

Current / mA = 300 therefore

Current = 300 mA this is correct :-)


Current (mA) = 300 transposes as:

Current = 300 per mA this is not correct

The above must be correct :-))


No what I want from an axis label is a description of the units I must
attach to the value I read on the graph. If the value is 300, and the
unit is mA of current, then current (mA) is the label I want to read.
It is not a formula - it is a description.

d
Pearce Consulting
http://www.pearce.uk.com

"Don Pearce" wrote in message
...
On Tue, 30 Nov 2004 20:20:37 -0000, "Oddjob"
wrote:

"Don Pearce" wrote in message
...
On Tue, 30 Nov 2004 20:01:56 -0000, "Oddjob"
wrote:

Nice graph Jim :-)

The labelling of your x y axis would be better (mathematically correct)
by
using / instead of ( )

Current / mA instead of Current (mA)

Oddjob ;-)


I've never bought this theory - that the axis of a graph is the other
side of an equation. As far as I am concerned the graph axis is the
current in milliamps - not one-over-milliamps (or current per milliamp
as you have it, which is dimensionless).

So it is Current (mA) - a good label
Not Current / mA - an incorrect representation of what is on the
graph.

But the axis is the description of the quantity on the graph, so that:

Current / mA = 300 therefore

Current = 300 mA this is correct :-)


Current (mA) = 300 transposes as:

Current = 300 per mA this is not correct

The above must be correct :-))


No what I want from an axis label is a description of the units I must
attach to the value I read on the graph. If the value is 300, and the
unit is mA of current, then current (mA) is the label I want to read.
It is not a formula - it is a description.

Point taken, it depends on one's education I suppose, my Physical Chemistry
lecturer pointed this out to me and I always label my axis as though it were
equal to the values on the graph. I have seen both types of label used with
total success. I'm sure some of the group will agree with you and some with
me....

hope we don't get a war of the axis label :-))

In article , Oddjob
wrote:
"Don Pearce" wrote in message
...
On Tue, 30 Nov 2004 20:01:56 -0000, "Oddjob"
wrote:

Nice graph Jim :-)

The labelling of your x y axis would be better (mathematically
correct) by using / instead of ( )

Current / mA instead of Current (mA)

Oddjob ;-)


I've never bought this theory - that the axis of a graph is the other
side of an equation. As far as I am concerned the graph axis is the
current in milliamps - not one-over-milliamps (or current per milliamp
as you have it, which is dimensionless).

So it is Current (mA) - a good label Not Current / mA - an incorrect
representation of what is on the graph.

But the axis is the description of the quantity on the graph, so that:

Current / mA = 300 therefore

Current = 300 mA this is correct :-)

"Correct" or not as an equation, like Don, it is not a usage I tend to
employ. It can confuse some students in my experience who are puzzled by
thinking they somehow have to divide the values by 'mA' or think of it as
being a 'current per mA'. I think the meaning of Current (mA) is fairly
clear, but of course, anything may be misunderstood. :-)

TBH I'm more concerned that I only obtained some fairly rough data over a
small range, etc.

Slainte,

Jim

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