topic Re: To change units in Matrix Column in Mathcad

To change units in Matrix Column

RWickrama — Wed, 31 Dec 2025 19:50:17 GMT

In my HVAC load calculation, I have the units in the matrix column in Watts.
But, I need units to be Btu/hr.
I tried various options without success. I request help.
Pl. see below.
Also attached Mathcad file.

Re: To change units in Matrix Column

Werner_E — Wed, 31 Dec 2025 20:31:36 GMT

The sad news is: Prime still can't do that!

You can only change the unit for all values in a matrix by using the placeholder after the matrix.

But this looks most often silly in case the matrix contains quantities of different dimensions

and it would fail if the matrix contains strings as in your case, because you can't apply units to a string.

Inside of a matrix Prime always will only show the standard unit, depending on the unit system you select and whether you check "Base Units" or not.

So the best you can achieve is to strip the unit (divide by the desires unit) and add a header indicating the unit. That's not really satisfactory, of course, especially when we consider that this is software that is (rightly) proud of its ability to handle units natively..

Re: To change units in Matrix Column

terryhendicott — Thu, 01 Jan 2026 04:42:33 GMT

Hi,

It can be done like this:

Cheers

Terry

Re: To change units in Matrix Column

RWickrama — Thu, 01 Jan 2026 19:13:05 GMT

Thanks. I like it.