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## How can I have Celcius not Kelvin on the X-axes of Prime plot

Help please - see the attach

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## Re: How can I have Celcius not Kilvin on the X-axes of Prime plot

Oviously it does not work the way it should (by simply chosing °C in the unit box) so one crude way is to do the conversion manually. Not very satisfying, I guess.

17 REPLIES 17

## Re: How can I have Celcius not Kilvin on the X-axes of Prime plot

Oviously it does not work the way it should (by simply chosing °C in the unit box) so one crude way is to do the conversion manually. Not very satisfying, I guess.

Thanks, Werner!

Same bag:

## Re: How can I have Celcius not Kelvin on the X-axes of Prime plot

The Kelvin and Rankine scales are absolute--they both start at absolute zero and are therefore a ratio.  Centigrade (Celsius) and Fahrenheit scales have arbitrary (and different) zero reference points.  Mathcad has to use functions for that conversion.  If you look under units the the ribbon, you can select which units to plot with.

## Re: How can I have Celcius not Kelvin on the X-axes of Prime plot

Not all is fine in Mathcad 15 too

## Re: How can I have Celcius not Kelvin on the X-axes of Prime plot

Hi Fred!

Think we found a bug in Prime 5!

What you show was exactly what I tried first (and Valery sure did so, too) and it failed because we both used Prime 5.

It works OK in Prime 4 but throws an error in Prime 5!

So the bug was freshly introduced with Prime 5 (and we thought there would be no development of Prime any more ;-)

## Re: How can I have Celcius not Kelvin on the X-axes of Prime plot

Maple has:

1. Fahrenheit
2. Celsius
4. Reaumur
5. Rankine
6. Kelvin

But the 7 not the 6 is a fine number! Do you know 7-th temperature scale? I Know!

## Re: How can I have Celcius not Kelvin on the X-axes of Prime plot

@Werner_E wrote:

So the bug was freshly introduced with Prime 5 (and we thought there would be no development of Prime any more ;-)

And the beat goes on . . . .

I guess with the new fancy graphing utility the built-in graphs could be farmed out to the interns.