Exporting sampled data from figure to matlab.

Hello there,

After sampling a sinusoid signal at a given sampling frequency,i want to export range of sample values for any time range from the sampled sinusoid to matlab for further computation.Kindly help me with the program/code to do the same.

[Jan]

The question is not clear yet. What are the inputs and and what is the wanted output?

[Raashid Hassan]

Thanks for your response.

I want to manupulate the sample vaulues of a sampled sinusoidal signal in matlab for further computation.I sampled the sinusoidal signal. Now i want to export the sample values of signal (from the graphic window-figure) at different instants to matlab so that I can use the same in my algorithm.

These sampled values from the sampled signal form the inputs for my algorithm of fault detection.

How can i export these values to my matlab workspace for further computation.

Regards,

[Fangjun Jiang]

XData and YData give you all the data of the curve in the figure! Hard to understand what you really want.

[Raashid Hassan]

Anyways , thank you ! Your help is much appreciable ! Can you please help me with another query : Suppose I have a large array of numbers , about 2807 entries eg A=(....0 3 4 5 7 8 9 5 5 7 8 9 0 4 1 4 5 7 8 .....) Now I wanna compute sum of certain numbers ,eg from 1500th entry to 1901th entry , likewise summation of other ranges ! How can I do that , kindly elaborate !This is required to develop an algorithm!

[Fangjun Jiang]

Users look for questions for ansers. If it is a different question, ask a separate question.

Answer 1

[Fangjun Jiang]

t=0:0.01:10
SinCurve=plot(t,sin(t));

XData=SinCurve.XData;
YData=SinCurve.YData;
NewX=resample(XData,5,3);

If you only have a figure, you can find the line

MyCurve=findobj(FigureHandle,'Type','Line')

[Raashid Hassan]

Thanks for your guidance and swift response ! What does XData=SineCurve.XData signify? Likewise for YData! Moreover , I wanna enlist the x,y coordinates of exported data in a matrix , kindly elaborate !

Regards,

[Fangjun Jiang]

XData and YData are the "x,y coordinates" that you are looking for.

[Raashid Hassan]

Thanks. Kindly help me for the following simple query : I wanna plot two sinusoidal waves of different amplitudes in continuation on the same axes . E,g y1= A.sin(t1) and y2= B.Sin(t2)... Where t2 starts at the same instant when t1 ends ,so that the curve is continued as a single graph with two different amplitudes for two periods of time .

[Fangjun Jiang]

Maybe using numeric data to explain is better. What are the values of t1, t2 and others?

[Raashid Hassan]

Ex . t1=0:60 t2=60:100 How to plot the two sinusoids on the same axes as a continued single graph?

[Fangjun Jiang]

This is yet another different question than the original one.