plotting time discrete data - Printable Version

plotting time discrete data - Printable Version

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plotting time discrete data - leprechaun - 06-23-2015 12:18 PM

Hi everybody!

I have a vector of time-discrete data. How do I plot a one dimensional vector?
Is there an app that does the Job or a smart way?
Either simply dots at the sampled Points or a polyline (implied polyline would be great anyway)?

say M1:=[0,1,2,3,4,0,1,2,3,4,0,1,2,3,4]; is a sampled sawtooth where the index into the vector is supposed to be my sample index. No absolute time needed, just implied tn.

RE: plotting time discrete data - Didier Lachieze - 06-23-2015 02:02 PM

You can use the "Statistics 1Var" app, after selecting it you need to move your data to the D1 list:
[attachment=2200]
then in the Symb view select Line as the type of Plot:
[attachment=2201]
and with Plot you can view your data:
[attachment=2202]

RE: plotting time discrete data - leprechaun - 06-23-2015 02:10 PM

I will present some results of my work. Not nearly satisfactional....

I decided to make a polyline(M) function that accepts a 1-dimensional vector as argument. It should use LINE_P() for plotting a polyline. That sounds nice, but I have the Feeling that i am stuck.
For my general understanding: LINE_P accepts a Vector of Points, i.e. vectors with 2 entries for the 2-dimensional Problems and a Vector of indices into the above buffer that define line segments. Similar to a vbo I think?

Help or an example on LINE_P with Point lists would be great!

second problem: when trying to convert my 1-dim vector into a points array I fail.

Code:

EXPORT polyline(data)

BEGIN

LOCAL v_data := MAKEMAT(I,length(data),2);

v_data(2):=TRN(data); //How to assign? What should the Points Array look like?

//LOCAL l_data:={{1,2},{2,3},{3,4},{4,5},{5,6}}; //How can I build such a vector in Dependance of length(data)? And row/column? Which format

//Will deal with that later.......

//RECT();

//LINE_P(v_data,l_data);

//FREEZE;

RETURN v_data; //Output for debugging

END;

How can assign a column in v_data? I realize that I am totally confused with row- and column vectos AND I do not know the best way to manipulate either with my prime.

Thanks a lot for your help. It will lead to a working function, hopefully!

RE: plotting time discrete data - leprechaun - 06-23-2015 02:11 PM

Thanks Didier!

However maybe you can help me getting my polyline() function working? It is a good way to learn.

RE: plotting time discrete data - Didier Lachieze - 06-23-2015 03:32 PM

(06-23-2015 02:11 PM)leprechaun Wrote: Thanks Didier!

However maybe you can help me getting my polyline() function working? It is a good way to learn.

Here is a very rough implementation of the polyline() function, you'll have to adjust the pixel mapping to your needs:

Code:

EXPORT polyline(data)

BEGIN

  LOCAL x_max, y_max;

  LOCAL L_Points, L_Lines;

  x_max:= length(data); y_max:=MAX(data);

  L_Points := MAKELIST({IP(I*300/x_max)+10, 220-IP(data(I)*220/y_max)+10},I,1,x_max);

  L_Lines := MAKELIST({I,I+1},I,1, x_max-1);

  RECT();

  LINE_P(10,230,320,230); LINE_P(10,10,10,230);   // Draw X & Y Axis

  LINE_P(L_Points,L_Lines,[[1,0],[0,1]]);

  FREEZE;

  RETURN L_Points; //Output for debugging

END;

RE: plotting time discrete data - Marcus von Cube - 06-24-2015 12:19 PM

Here is another rather simple way using the Function app:

[Image: Discrete_Plot_Symb_View.png]