 calculator solving linear eqns in terms of unknown - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: calculator solving linear eqns in terms of unknown (/thread-6961.html) calculator solving linear eqns in terms of unknown - yland - 10-02-2016 05:26 PM My friends less expensive ti solves a 3x4 system of linear equations in terms of 4th unknown. How do i do this on my prime? Example 2a+2b+2c=0 3a+b+2c=0 a+b+c=W I want to get all my variables in terms of W. The type of problem im solving is a statics problem and im asked to find the maximum weight of flowerpot if the chain can hold a max 50lb tension. So W represents the maximum weight (flowerpot) that the system can hold. How do i input this? RE: calculator solving linear eqns in terms of unknown - primer - 10-02-2016 07:09 PM (10-02-2016 05:26 PM)yland Wrote:  2a+2b+2c=0 3a+b+2c=0 a+b+c=W your 3rd and 1st equation says that W is useless in your system. (divide by 2 your first equationto see it) lets change your 3rd equation by : a+b+2c=W then you can use linsolve to get it : linsolve([2*a+2*b+2*c=0 3*a+b+2*c=0 a+b+2*c=w],[a b c]) it gives : [-1/2*w, -1/2*w w] that's a,b and c in term of w. RE: calculator solving linear eqns in terms of unknown - yland - 10-02-2016 07:25 PM Thank you primer. Appreciate the help RE: calculator solving linear eqns in terms of unknown - yland - 10-02-2016 08:51 PM Im getting error: bad argument value RE: calculator solving linear eqns in terms of unknown - Mark Hardman - 10-02-2016 09:37 PM (10-02-2016 08:51 PM)yland Wrote:  Im getting error: bad argument value Try: linsolve([2*a+2*b+2*c=0,3*a+b+2*c=0,a+b+2*c=w],[a,b,c]) Mark Hardman RE: calculator solving linear eqns in terms of unknown - Aries - 10-03-2016 04:09 PM (10-02-2016 05:26 PM)yland Wrote:  My friends less expensive ti solves a 3x4 system of linear equations in terms of 4th unknown. How do i do this on my prime? Example 2a+2b+2c=0 3a+b+2c=0 a+b+c=W I want to get all my variables in terms of W. The type of problem im solving is a statics problem and im asked to find the maximum weight of flowerpot if the chain can hold a max 50lb tension. So W represents the maximum weight (flowerpot) that the system can hold. How do i input this? There is something about your system that does not sound right to me: 2*a+2*b+2*c=0 --> (a+b+c)=0 then W=0. Could you please rewrite the exact equations ? Best, Aries ;-) RE: calculator solving linear eqns in terms of unknown - yland - 10-03-2016 05:11 PM thanks for the replies and help, those are not actual eqns I just wanted to give an idea of the form I was dealing with. I figured out why I was getting the error, I was not aware of the different ways to access linsolve command. Basicly I was using LinSolve. Now all is well thanks again. RE: calculator solving linear eqns in terms of unknown - Aries - 10-06-2016 02:55 PM (10-03-2016 05:11 PM)yland Wrote:  thanks for the replies and help, those are not actual eqns I just wanted to give an idea of the form I was dealing with. I figured out why I was getting the error, I was not aware of the different ways to access linsolve command. Basicly I was using LinSolve. Now all is well thanks again. You're welcome, yland ;-) Best, Aries :-)