Solution 27470: Issues following example Time-Value-of- Money Function in the TI-89 Titanium and Voyage 200 Guidebooks
Why do I get an error when following the example Time-Value-of- Money Function in the TI-89 Titanium and Voyage 200 Guidebooks?
The example titled "Time-Value-of- Money Function" in both the TI-89 Titanium and Voyage 200 Guidebooks has a typo.
The example listed in the guidebook lists spaces where multiplication signs are supposed to be listed. The corrected instructions are listed below:
tvm(temp1,temp2,temp3,temp4,temp5,temp6)
Func
Local tempi,tempfunc,tempstr1
-temp3+(1+temp2/1200*temp6)*temp4*((1-(1+temp2/1200)^(-temp1))/(temp2/1200))-temp5*(1+temp2/1200)^(-temp1)®tempfunc
For tempi,1,5,1
"temp"&exact(string(tempi))®tempstr1
If when(#tempstr1=0,false,false,true) Then
If tempi=2
Return approx(nSolve(tempfunc=0,#tempstr1)|#tempstr1>0 and #tempstr1<100)
Return approx(nSolve(tempfunc=0,#tempstr1))
EndIf
EndFor
Return "parameter error"
EndFunc
To correct this error please either follow the instructions listed above or download the attached TVM Function and transfer it to your calculator.
Please Note: You can also use the Finance Application for the TI-89 Titanium and Voyage 200 to solve Time Value of Money Functions.
