Graphing Differential Equations (Slope Fields)
01-27-2017, 05:10 AM (This post was last modified: 01-27-2017 07:15 AM by CloudHP.)
Post: #1
 CloudHP Junior Member Posts: 10 Joined: Jan 2017
Graphing Differential Equations (Slope Fields)
I'm currently using my HP Prime's geometry app CAS plotfield() function to graph my slope fields, however the lines are a bit longer than how I want. Is there any way to make the tangent lines shorter?

I want it to be something similar to this:

Currently, mine looks like this:

01-27-2017, 06:06 PM
Post: #2
 Tim Wessman Senior Member Posts: 2,231 Joined: Dec 2013
RE: Graphing Differential Equations (Slope Fields)
(01-27-2017 05:10 AM)CloudHP Wrote:  https://drive.google.com/file/d/1ef9Zmfi...sp=sharing

Hello,

Are you manually typing in a 'plotfield' command? Or using the little popup editor that appears when you press the Plot->slopefield in your plot view?

If you don't see a little editor when you do that, that means you aren't up to date in your Prime software. I ask because the editor screen automatically adds in the required 'normalize' tag at the end to give you what you'd like here.

plotfield(sin(x),[x = ((-16.) .. 16.),y = ((-11.) .. 10.9)],xstep = 2.5,ystep = 2.5,'normalize') <-- note the 'normalize' as the last argument.

TW

Although I work for the HP calculator group, the views and opinions I post here are my own.
01-27-2017, 10:17 PM (This post was last modified: 01-28-2017 01:08 AM by CloudHP.)
Post: #3
 CloudHP Junior Member Posts: 10 Joined: Jan 2017
RE: Graphing Differential Equations (Slope Fields)
(01-27-2017 06:06 PM)Tim Wessman Wrote:
(01-27-2017 05:10 AM)CloudHP Wrote:  https://drive.google.com/file/d/1ef9Zmfi...sp=sharing

Hello,

Are you manually typing in a 'plotfield' command? Or using the little popup editor that appears when you press the Plot->slopefield in your plot view?

If you don't see a little editor when you do that, that means you aren't up to date in your Prime software. I ask because the editor screen automatically adds in the required 'normalize' tag at the end to give you what you'd like here.

plotfield(sin(x),[x = ((-16.) .. 16.),y = ((-11.) .. 10.9)],xstep = 2.5,ystep = 2.5,'normalize') <-- note the 'normalize' as the last argument.

I am going into the commands in the CAS Geometry, hitting plot and then hitting slopefield. Does this mean my software is out of date? I just plugged it in recently and it said I had software updates so I updated. I can use the normalize function which just types normalize() into the equation. How would I use it in correlation to the plotfield function?

Also sorry, could you explain a brief tutorial on how to graph slope fields in general? What do the vector variables mean? I am a bit confused. Thanks.
01-28-2017, 01:15 PM
Post: #4
 mark4flies Member Posts: 112 Joined: Jan 2015
RE: Graphing Differential Equations (Slope Fields)
Did you read the user guide? It explains how to produce the slope field you want in Chapter 9, Geometry App, specifically page 162, in the latest edition.
01-29-2017, 06:42 AM
Post: #5
 CloudHP Junior Member Posts: 10 Joined: Jan 2017
RE: Graphing Differential Equations (Slope Fields)
(01-28-2017 01:15 PM)mark4flies Wrote:  Did you read the user guide? It explains how to produce the slope field you want in Chapter 9, Geometry App, specifically page 162, in the latest edition.

Oh okay, thanks so much! I figured it out.
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