Locking Calculated points on a graph

[G. Cook]

How can calculated points (i.e. roots,intersections, extremums, etc) be locked on a graph so that other operations (i.e. areas, tangents, etc) can be performed without having to record the points on paper and re-enter?

[froehlic]

You may store the values of X and Y in other variables. While plot is open and the cursor is in a specific position on your graph (intersection, root or whatever) you directly type

X Sto A
or

Y Sto B

These values can wherever be reused, e.g. as the beginning of an integration. If you start graphical integration and you have to type the lower end, simply type A. You also can use the variables in home or CAS for other calculations. But: You can't store [X Y] directly in functions into another variable. For that you have to go to home or CAS and after storing you may call your plot again and jump to a second position and repeat that action.

[Carlos295pz]

Send X to Home → [Home] [Xt0n] [ENTER]
Back to Plot → [Plot]
Call the Home data → [Menu] [1] - Choose history data

[pinkman]

(06-04-2020 10:58 PM)froehlic Wrote:  You may store the values of X and Y in other variables. While plot is open and the cursor is in a specific position on your graph (intersection, root or whatever) you directly type

X Sto A
or

Y Sto B

Well X STO A opens the “Go to” window, but keying [Alpha] and one of [1] ... [9] key moves the graph, using the num pad like arrows.
Nb: To make this work in RPN entry mode, use postfix syntax : X ‘A’ Sto Enter

(06-05-2020 01:47 AM)Carlos295pz Wrote:  Send X to Home → [Home] [Xt0n] [ENTER]
Back to Plot → [Plot]
Call the Home data → [Menu] [1] - Choose history data

In the Plot view the Menu entries 1 and 2 are grayed out. To see the values from Home, first hit “Go to” soft key, the “Edit”, then [Menu] [1]

[jte]

(06-06-2020 12:37 PM)pinkman Wrote:  ⋮
In the Plot view the Menu entries 1 and 2 are grayed out.

Hmmm.... yes, for consistency, it might make sense for Menu / Get from Home to work from Plot views. (Although first entering Go To seems a bit more natural to me.)

(06-06-2020 12:37 PM)pinkman Wrote:  To see the values from Home, first hit “Go to” soft key, the “Edit”, then [Menu] [1]

Yes, it seems some dialogs only allow Menu / Get from Home after Edit is pressed. Noted!