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Help me analyze a graph plotted in MATLAB

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find point graph matlab

I just conducted an experiment on DC Magnetization characteristics and noted down all the values... I thought of analysing the values using MATLAB... I entered the field current in one matrix and the voltage in another matrix... I could plot the graph... Now how do i find out things like critical resistance, critical speed and more from the graph using MATLAB... I know how to find them using a normal graph sheet but i'm unable to find out info on how to go about it in MATLAB... I need to draw a tangent at a point and draw parallel lines and do such things... Can someone help me on how to do this in MATLAB? Please Help...
 

how to plot a sigma graph in matlab

Hi,
you need to do this manually or by zooming thematlab graphs.
brmadhukar
 

sigmaplot

graphs are only diagrammatic representation of the already calculated values. so u cant append anything or make the graph plot the desired values for u. its just a representation. incase u want to find some point and plot them etc... u could do like this,

u would have a formula to find the critical resistance,.. like at this voltage etrc... then u could find the voltage from the set of values and then find the corresponding current and then use the hold on function in matlab and then, plot a point there.. so that it would look like the resistance point. i mean the x,y location., u could only go abt something like that! :)

good luck

/cedance
 

matlab+graph

I would suggest u use some other tool for graphs. something like sigma plot which is an exclusive graphing tool. U could plot graphs with a variety of features.. this might help.
abhi
 

matlab graph analysis

abhigopal said:
I would suggest u use some other tool for graphs. something like sigma plot which is an exclusive graphing tool. U could plot graphs with a variety of features.. this might help.
abhi
Click to expand...
I agree. I used it when simulating AC machine.
In Matlab you sholud use hold on function then draw another graph on your existing to find x,y values of interest.

Is there any way to show some points (x,y) on matlab graph automatically e.g. if I want to show some point and its coordinates?
 

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