Numerical solver in Nspire?

[luisp]

Hello.

In TI-84 there´s an equation solver that works like this:

You write an equation like 0=3a+5f+8u

a=?
f=?
u=?

you can then input the values you want and resolve in the variable you
want.
If you have to try several times, this is a very good quick way of
doing it.

Does anyone know how to do this in the TI-Nspire calculators??

This is also called the numerical solver in the Voyage 200 (wich is
more what I want the Nspire to do)

Thnaks

[Ray Fox]

Store two of the variables, example a = 3 and f = 4

Then use nsolve(3a+5f+8u=0,u)

It will calculate u

 if you want to solve for a different variable, say "f" you must first clear the value of f

delvar(f)

 

Hope that helps,

 

Ray Fox

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[Sean Bird]

You wouldn't need to clear it if you used the vertical bar ("such that")
e.g.
nsolve(3a+5f+8u=0,u)|a=3 and f=4

This does seem like a potential for a Script.

[Ray Fox]

I always love your aproaches!!

 

Thanks,

 

Ray

[Amanda Land]

GET OUT!! I didnt know it could do that....i always have to hate saving a value for a variable because I always forget to clear it....most of the stuff yall talk about us over my head.....but I love learning about those little tricks I can share with my Algebra 1 students.

[Sean Bird]

 Thanks. I meant to add the location of the vertical bar is ctrl = with the relational characters. I am pleased that on the new CX it shows the vertical bar with the not equal and greater than or equal to in blue above =. (Since there is space for it, I would be pleased if it was also accessible from the punctuation button. It currently is not.) The Clickpad had its own designated key under ctrl for |. (That also provided a shortcut for factorial: ctrl |.)

With the TI-Nspire CAS I recommend that student use the vertical bar to limit the domain. As a simple example (see the Scavenger Hunt)
solve(sin(x)=1/2,x)|-pi<x<pi    (If you are in radians.)
With the numeric Nspire you will only get one of the two solutions.

-- Sean Bird

T³ - Teachers Teaching with Technology - Instructor

T³’s mission is “to provide quality professional development that enables the mathematics and science educator to be successful in the classroom through the appropriate use of technology." 

>> You wouldn't need to clear it if you used the vertical bar ("such that")
>> e.g.
>> nsolve(3a+5f+8u=0,u)|a=3 and f=4
>>

>> On Fri, Sep 16, 2011 at 3:28 PM, Ray Fox <kenr...@gmail.com> wrote:
>>
>>> Store two of the variables, example a = 3 and f = 4
>>> Then use nsolve(3a+5f+8u=0,u)
>>> It will calculate u
>>> if you want to solve for a different variable, say "f" you must first
>>> clear the value of f
>>> delvar(f)
>>>
>>> Hope that helps,
>>>
>>> Ray Fox
>>> On Fri, Sep 16, 2011 at 3:40 AM, luisp <luis...@mail.com> wrote:
>>>
>>>> Hello.
>>>>
>>>> In TI-84 there´s an equation solver that works like this:
>>>>
>>>> You write an equation like 0=3a+5f+8u
>>>>
>>>> a=?
>>>> f=?
>>>> u=?
>>>>
>>>> you can then input the values you want and resolve in the variable you
>>>> want.
>>>> If you have to try several times, this is a very good quick way of
>>>> doing it.
>>>>
>>>> Does anyone know how to do this in the TI-Nspire calculators??
>>>>

>>>> This is also called the numerical solver in the Voyage 200 (which is

>>>> more what I want the Nspire to do)
>>>>

>>>> Thanks
>>>>

[Nevil Hopley]

You may be interested to know that I wrote a class activity that
teaches students to use the nsolve(...) command intelligently,
including restriction of domains.
In addition, the activity shows students that equations can be solved
both graphically as f(x)=g(x), or as f(x)-g(x)=0.

You can download the activity pdf file from the following link at the
UK's Nspiring Learning Website:
http://resource.nspiringlearning.org.uk/classroomresources/activities/activity.jsp?id=354

I hope this is of help or use.

Nevil