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+--- Thread: Non solution for 2 equations with 2 variables (/thread-8848.html)
Non solution for 2 equations with 2 variables - jtamezga - 08-16-2017 02:51 PM
Lets gonna suppose you want to solve 2 equations (non linear) with 2 variable using the SOLVE app.
The objective is define the sample size and maximum of non conforming product permited (desig of a sampling plan). Then I need to use the probability function BINOMIAL.
So the system of equations are:
0.95=BINOMIAL_CDF(X,0.015,Y)
0.10=BINOMIAL_CDF(X,0.045,Y)
The practical and correct answer is X=260 and Y=7
For this kind of system X and Y are integers and positive using minitab but using other kind of computational solver this 2 variables can result real and positive ... its ok, no problem.
The problem is, if you use the SOLVE app, you can't get the answer, and after a minute, sometimes, the calculator can crash ... you can use initial values like 0, 1, 0.5 and 100, but never get the correct answer.
Please, help!
RE: Non solution for 2 equations with 2 variables - roadrunner - 08-17-2017 07:09 PM
I think the solve app uses either bisection or newton's method. Both require continuity about the point of solution. BINOMIAL_CDF() is not.
Don't know why you experienced a crash. My emulator just didn't give an answer. Are you running the latest version?
-road