Change subject of an expression
in [Matlab]
|
From: Chris B on 21 Jun 2010 04:36 I apologise for my ignorance as im returning to education having had a significant gap. As part of a flow measurement course I am trying to transpose some complex polynomials (if that is the right terminology). All the search terms i can think of are coming up with nothing and I’ve been trying to work out how to do it with some simpler examples. Rt = R0(1+At+Bt^2+C(t-100)t^3) Rt & R0 are real numbers so can simplify to 0 = Ct^4-100Ct^3+Bt^2+1-(Rt/R0) Is there a simple function I can use within MATLAB to make t the subject of this formulae? Thanks in advance any help greatly appreciated. Regards Chris
From: Steven Lord on 22 Jun 2010 14:30 "Chris B" <c.m.buckley(a)thisbitisntneeded-hotmail.co.uk> wrote in message news:hvn89l$321$1(a)fred.mathworks.com... >I apologise for my ignorance as im returning to education having had a >significant gap. As part of a flow measurement course I am trying to >transpose some complex polynomials (if that is the right terminology). All >the search terms i can think of are coming up with nothing and I’ve >been trying to work out how to do it with some simpler examples. > Rt = R0(1+At+Bt^2+C(t-100)t^3) > Rt & R0 are real numbers so can simplify to > 0 = Ct^4-100Ct^3+Bt^2+1-(Rt/R0) > Is there a simple function I can use within MATLAB to make t the subject > of this formulae? Do you mean you're trying to solve for t as a function of C, B, and (Rt/R0)? If so, and you're using Symbolic Math Toolbox to solve this symbolically, use SOLVE. If you're trying to solve this numerically [and you have values for C, B, and (Rt/R0)] either FZERO or ROOTS will work. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
|
Pages: 1 Prev: multipath simulation with FM modulation Next: edit box key debounce |