how to plot graph

Can anyone tell how to plot the following graph plz

http://imgur.com/XhmeAuY

Answer 1

[Walter Roberson]

is it possible to do using sin or cos function with for loop

Yes, but you probably don't want to do that.

The curve you show is not a simple sine or cosine or simple sum or product of sines or cosines. However, since the curve has a finite number of samples (pixels), you could measure the coordinates on a pixel-by-pixel basis and then use an FFT to transform it into an implicit sum of sine waves, each with amplitude and phase. And then, with those amplitude and phase components on hand, you could go through the trouble of reconstructing the plot by calculating all of the sine components and adding them all up. That would be a loop using sine functions. But if you had all of the measurements needed to do this, it would be a lot more efficient to just plot in (x,y) coordinates directly.

Somewhere in the File Exchange is (or was!) a routine that could read image files and interpret the image as a graph to figure out what the data values were. Unfortunately I cannot seem to find the routine.

[Image Analyst]

I've had that one bookmarked for a while:

http://www.mathworks.com/matlabcentral/fileexchange/36904-matlab-script-for-digitizing-a-published-graph

He could also read in the image with imread() and then use imfreehand (in the Image Processing Toolbox) to trace the curve getting coordinates. Then use ginput(1) to locate the origin and subtract this from the coordinates returned from imfreehand. Then put in the graph units to pixels ratio as a calibration factor that you multiply by, and you're done.

Answer 2

[Azzi Abdelmalek]

If you have the data (y for example) use

plot(y)
legend('ESD status')
grid on

[nkumar]

The thing is i dont have datas

[Azzi Abdelmalek]

You can get the data from the figure you have posted

[nkumar]

is it possible to do using sin or cos function with for loop

[Azzi Abdelmalek]

But it 's not a cos or sin function. Can you explain what is your goal? and what this curve represent?