Determine the X coordinate in the 2D plot???

Hello

I have performance plot which i need to select the best settling time,rise time and peak OS for step response for my new gain values based on them. Lets say, i wana determine the values of the settling time for a set of simulation using

ts(n-1)=s1.SettlingTime;

where n<=15

yy are the 21 values of iteration. All the settling time are given as yy below.

Now using

ymin=min(ts)

i get the min value of 6.4943 seconds

i can get the minimum time without referring to the plot. which in my plot is also same as in red.The x-axis is the iteration number.. which is 21 iterations (0-20) and y are the different settling time values.

Now my issue is, what command should i use that my program will automatically choose the min value from the Y-axis and determine its cooresponding X-axis (iteration number) so that i can you for next task of my program.

Please help me. Thank you.

Answer 1

[Geoff Hayes]

Nitesh - get the index of the minimum value of y and use that index to access the corresponding iteration. So

 [ymin, yminIdx] = min(y);
 yminIteration   = x(yminIdx);

In the above, I am assuming that x is the corresponding vector with iteration information (and that all values of y are distinct). See min for details on the second output parameter of this function.

[Nitesh]

Thank you so much.

This command stores the value for me to use it further into my program. Thanks.

Nitesh.