sample average

[looser]

I was keeping worse part for the end. The biggest problem is the sweeping process.. Well, I command the current supply setting sweep rate and the limits, but out put of the current supplier is not exactly what i set which means my x values slmight slightly change for each spectrum.

briefly, it could be fowwloing 

i (iteration)        Current value             corresponding multimeter value(y)           array of x                array of y

     0                         0                                              y0                                            [0]                               [y0]

     1                         1.001                                         y1                                   [1001,0]                            [y1,y0]

     2                         1.9998                                      y2                                [1998,1001,0]                         [y2,y1,y0]

     :                          :                                                 :                                                :                                   :

12(new sweep)      0.002                                       y12                      [0.002,-1.001,-2...0...1.9998..,0]     [y12,y11.....y0]

13                           0.996                                         y13                         [0.996,0.002,-1,2..0...2..0]                [y13,y12,y11...y0]

and it can change the number of steps in each sweep. That s bad, but unfortunately i have this condition. So I can do 2 things, either i can roll the x values so that i would not need also to average x values? but i have no idea how i can make sure the number of steps is going to be same for each steps?

This is my ph.d thesis and i dont want to miss any data:)

[GerdW]

Hi looser,

if your x-values also differ, you should create your own algorithm similar to this:
collect all y-values where the x-value is near by a setpoint (only different by +-epsilon).

If this is your phd-thesis do we get some acknowledgments for our help?

[looser]

🙂 Definetely the following is gonna be written in the thesis"" the data acquisation software has been written by Labview Forum""

I have no idea where to insert that alghoritm, and to write it with LV? if it s really complicated, i can neglect the those small differs in the x values:)

[GerdW]

*** double entry deleted ***

Message Edited by GerdW on 04-12-2007 04:36 PM

[GerdW]

Hi looser,

here's an example for my proposed algorithm. It's straight-forward, no error checking, no optimizations...

On your phd: now we only need the publication reference for our own papers!

[looser]

🙂 finding reference is the hardest part even harder than the ph.d itself...:)

Could you please convert it to 7.0 that i have as a poor ph.d student:)

[GerdW]

Hi looser,

here it is!

[looser]

thanks GerdW,

but still dont understand, how this vi ll decide the which elemts of each array will be added and averaged?

I mean how it s gonna average, for example, the y value( first element of averaged array) of corresponding 0th 13th and 26th for 3th average process? 

[GerdW]

Hi looser,

this vi gets some x-data and corresponding y-data.
Then it looks for x-values around a given setpoint (±epsilon). For those x-values it is collecting the corresponding y-values and calculates the mean.
You said you want to calc the mean for y-values at certain x-points (with some noise on the x-values)...
This vi doesn't check for the index of the y-value, it only checks for the corresponding x-value!

[looser]

Thanks for manual:) just to check if i nderstood correctly.. so it can perform the process below lets say i have

X= 0.1, 1.2, 2.4, 3.3 ...       corresponding  y values= 2, 4, 6, 8 ....

x= 0.2, 1.1, 2.3, 3.05  ...     corresponding  y values= 2.2, 3.8, 5.8, 7.6....

and assume that i get those values continously in a loop. Now i connect the ''X set "" to x value generater (which is current supply) and set epsilon as 0.3..( thats the maximum shift i expect)

and i am plotting averaged loop providing i have the corresponding arrays

x=0.15, 1.15, 2.35, 1.675 ....        corresponding y values= 2.1, 3.9, 5.9, 7.8  .....

and i have xy graph!! is it true?