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24-Ruby IV
September 11, 2013
Solved

Units and solving of system of linear equation - one problem or bug

  • September 11, 2013
  • 1 reply
  • 8312 views

One task (see pictures and load files Mathcad Prime 2.0):

FindWithUnits.png

All is OK!

But it is a linear system and it is better use the lsolve function:

MxvWithUnits.png

Mathcad Prime can not works here with units and I must do so:

MxvWithOutUnits.png

It it a bug in new possibility of Mathcad Prime (different dimensions in array) or I do something wrong? Thanks!

Best answer by ValeryOchkov

I was a students nd I was wondering why there can not be to change by place factors.

Sometime I ask this of mathematicians now too. They do not tell me I'm a fool - they tell me that I have an engineering approach to mathematics

abba.png

Why!?

See alphabet!

1 reply

5-Regular Member
September 11, 2013

In a mixed unit matrix, you need to assign the units to 0's explicitly.

Define:

M.pngand v.png

--Jakov

24-Ruby IV
September 11, 2013

Thanks, Jakov!

But in the Solve block 0 and 0*Unit is equal - it was my...

Better use not V, ohm and A but mV, mohm and mA

And second:

MxvWithUnits2.png

25-Diamond I
September 11, 2013

Not sure what the problem should be? v*M^(-1) can't work - using units or not.

matrixunits.png