Solved: UNITS NOT COMPATIBLE WHILE GRAPHING

ppal · ‎Dec 30, 2021

HI

CSV DATA FILE and MATHCAD PRIME ATTACHED - ERROR ON PAGE 6. I need to put km "somewhere". Plotting skills limited!.

Thanks for the help.

StuartBruff · ‎Dec 30, 2021

@ppal wrote:

HI

CSV DATA FILE and MATHCAD PRIME ATTACHED - ERROR ON PAGE 6. I need to put km "somewhere". Plotting skills limited!.

Thanks for the help.

dnorm doesn't like units (as Luc also surmised ... I hadn't seen Luc's message before starting to reply) and neither do the limit markers in the plot (?? ... seems odd).

I defined a function numeric to get rid of the units, leaving the numeric value in Mathcad's base units. I also defined a version of dnorm (with label Variable) that removes units (the built-in one is still available if you use the Function label). Use numeric in the limit markers as well.

Mathcad Prime 7 worksheet attached.

Stuart

View solution in original post

LucMeekes · ‎Dec 30, 2021

Prime sure doesn't like the start and end labels of your x-axis (mu-3*sigma and mu+3*sigma), because they contain units.

Then I wonder if dnorm() allows its parameter values to have units. Can't check because dnorm() is a Premium function, so not supported in Prime Express.

You wonder where to put the km ? Maybe you should divide mu and sigma by it.

Experiment and find out.

Success!
Luc

StuartBruff · ‎Dec 30, 2021

@ppal wrote:

HI

CSV DATA FILE and MATHCAD PRIME ATTACHED - ERROR ON PAGE 6. I need to put km "somewhere". Plotting skills limited!.

Thanks for the help.

dnorm doesn't like units (as Luc also surmised ... I hadn't seen Luc's message before starting to reply) and neither do the limit markers in the plot (?? ... seems odd).

I defined a function numeric to get rid of the units, leaving the numeric value in Mathcad's base units. I also defined a version of dnorm (with label Variable) that removes units (the built-in one is still available if you use the Function label). Use numeric in the limit markers as well.

Mathcad Prime 7 worksheet attached.

Stuart