Wim,
I am not clear on what you want. If you want the output of the USB-6008 to stay the same, then you need a peak hold circuit between the signal source and the analog input to the USB-6008. If you want to change the data in your array, you need to specify how long to hold the value.
Looking at the peak at 62 in your image the data around it looks like:
60 0,52
61 0,51
62 1,6
63 0,52
64 0,52
65 0,51
66 0,51
Do you want something like this?
60 0,52
61 0,51
62 1,6
63 1,6
64 1,6
65 1,6
66 0,51
To do this, replace 3 elements after the peak with the peak value.
If this is not what you want, please try to explain more clearly, perhaps with a marked up image or numerical example like mine above.
Lynn
