Nevertheless you experience that strange error. If yes, try to reformulate your function rĭo you get the result or do you still experience that error? The values of a and b must meet these requirements: a < b and f (a) and f (b) must be of opposite signs. If they are specified (bracketed), root finds var on this interval. It returns the value of var to make the function f equal to zero. When operating on vectors, poly and roots are inverse functions, such that poly(roots(p)). What do you get when you evaluate B(10)=? Do you get The root function takes the form root (f (var), var, a, b). The poly function converts the roots back to polynomial coefficients.
So lets try some changes (I am just poking around in the dark): The root function takes the form var, a, b).
#Mathcad polyroots function how to
Mathcad is advertised You use it the same way you learned how to do. Using this new function I1 and a similar one for I2 already cuts the time to calculate r to one third and the whole sheet could be speeded up much, much more, I guess. algebra, factoring, fractions, exponents, functions and equations, inequalities. Her a small example - the function I1(i): Your version of this function calls the solve block for f three times while the version below calls it only once (and we don't need the function x1(i) and x2(i) you defined above anymore): The polyroots function is used to solve for all solutions to a polynomial equation at the same time. This could be speeded up significantly by creating a function which calls the solve blocks just once and then calculates and returns ALL of the necessary coefficients in a vector.ĭoing so would be quite some work in rewriting the sheet but probably worth the time spent. every call evaluates the solve blocks again and again. When calculating your various coefficients a(i), b(i), etc. I also experience no problem in evaluating your function r (Mathcad 15, M045). Maybe the problem is due to a bug in an older version which already is fixed?ĭo you get the error already in the last line of your sheet when you just define the function r or when you try to evaluate it via r(10)= Which version and maintenance release of Mathcad are you using?
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