Reorder 2D array

[pabgarva]

Hi all

I would like to know your opinion about this issue I am facing in Labview: 

I have 4 input signals in my FPGA which look like this:

The signals are saved independently in arrays (size: 3600). The first signal is centered around 1800 and I would like to reorder the others to also be centered around 1800. There is a fix delay between the signals, so my first option was to created a "for" loop that  "point by point" reorders the array. The signals correspond to pressure traces from all cylinders of an internal combustion engine. Is there any other way to reorder the signals? Maybe using defined functions in labview...

Thanks

Regards, 

Pablo

[RavensFan]

Use Index Array to break up your 2-D array into the individual channels.  Use Rotate 1-D array to rotate each 1-D array however many elements necessary to get the peaks to line up.  Use Build Array to put the individual 1-D arrays back together into a 2-D array.

[pabgarva]

Thanks for your reply. Should I use a for loop for those operations? It would be really useful if someone could post a picture of the structure. 

Thanks in advance!

Pablo

[GerdW]

Hi Pablo,

when there is a fixed delay between those 4 channels you should store the measurement values into the correct elements right from the start!

No need to reorder big arrays afterwards on the FPGA…

[pabgarva]

Thanks GerdW.

Actually they are not reordered on the FPGA. They are saved without reordering for its use with Matlab, but to check that all cylinders perform in the same way is good to plot them in one single plot and phased at 1800. 

Regards, 

Pablo

[GerdW · Accepted solution]

Hi Pablo,

the use Raven's suggestions to rotate 3 of those 4 channels to the correct position…