add vertical line to plot2d

[Tamas Papp]

Hi,

How can I add a (preferably dashed or dotted) vertical line to a 2d plot
at a given value? Eg add a vertial line at x=%pi to

plot2d([sin(x)],[x,0,2*%pi]);

I thought of using [discrete, ...] but then I don't know how to
calculate the starting and ending y in a simple way (obviously in the
example I could, but I am thinking about general plots).

Best,

Tamas

[Gunter Königsmann]

The draw package would even provide you with lines as graphical objects. But AFAIK neither of the graphics packages returns a list of the values that are to be plotted even if the adaptive plotting routine will construct one and pass the points to gnuplot.

One could tell solve to generate a list of x values with diff(f(x),x)=0 and then do a apply(max, list). But there might be equations where the diff or the solve will fail.

Post by Tamas Papp
Hi,
How can I add a (preferably dashed or dotted) vertical line to a 2d plot
at a given value? Eg add a vertial line at x=%pi to
plot2d([sin(x)],[x,0,2*%pi]);
I thought of using [discrete, ...] but then I don't know how to
calculate the starting and ending y in a simple way (obviously in the
example I could, but I am thinking about general plots).
Best,
Tamas
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[Gunter Königsmann]

Did try to implement the algorithm:


x_start:-10;
x_end:10;

f(x):=x^2-x^4;
s:solve(diff(f(x),x)=0);

ListOfInterestingX:[]$
len: length(s)$

for i:1 thru len do
if is(at(x,s[i])>x_start) and is(at(x,s[i])<x_end) then
push(at(x,s[i]),ListOfInterestingX);

yValuesToLookAt:append(
makelist(f(i),i,ListOfInterestingX),
[f(x_start),f(x_end)]
);

Maximum=apply(max,
yValuesToLookAt
);
Minimum=apply(min,
yValuesToLookAt
);

But there might be curves that are less benign than my f(x).


Kind regards,

Gunter.

[Jaime Villate]

Post by Tamas Papp
How can I add a (preferably dashed or dotted) vertical line to a 2d plot
at a given value? Eg add a vertial line at x=%pi to
plot2d([sin(x)],[x,0,2*%pi]);

The simplest way I can think of is (I don't know if that's what you want):

plot2d([sin(x),[discrete,
[[%pi,0]]]],[x,0,2*%pi],[style,lines,points],[point_type,plus],[color,blue,black],[legend,false]);

Jaime

[Adam]

Post by Tamas Papp
Hi,
How can I add a (preferably dashed or dotted) vertical line to a 2d plot
at a given value? Eg add a vertial line at x=%pi to
plot2d([sin(x)],[x,0,2*%pi]);
I thought of using [discrete, ...] but then I don't know how to
calculate the starting and ending y in a simple way (obviously in the
example I could, but I am thinking about general plots).
Best,
Tamas
------------------------------------------------------------------------------
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
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You can also use grid , like here :

Loading Image...

or imulses :

https://commons.wikimedia.org/wiki/File:Comb.svg


HTH

Adam

http://commons.wikimedia.org/wiki/Category:Images_with_Maxima_CAS_source_code

[Fred Senese]

Post by Tamas Papp
Hi,
How can I add a (preferably dashed or dotted) vertical line to a 2d plot
at a given value? Eg add a vertial line at x=%pi to
plot2d([sin(x)],[x,0,2*%pi]);
I thought of using [discrete, ...] but then I don't know how to
calculate the starting and ending y in a simple way (obviously in the
example I could, but I am thinking about general plots).
Best,
Tamas
--------------------------------------------------------------------------

----

Post by Tamas Papp
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
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id=153845071&iu=/4140/ostg.clktrk
You could plot it first without the vertical line to get the start and
ending y (-1 to 1 here), and then do something like

plot2d([sin(x), [parametric, %pi, t, [t, -1, 1]]],[x,0,2*%pi],
[style,lines,dots],[color,blue,black],
[legend, false]);