Measure Rise time

I am using the function
y = FrontPanel_wave_1st_transition_rise_time(data,base,top,base_threshold_pct,top_threshold_pct)
to measure the rise time of a signal by transient simulation. I would like to sweep the input frequency and measure the rise time for each output. This function appears to be failing while using sweep. Is there a workaround?
I realise that while seeping the frequency, my data output is a 2 dimensional array and if I specify the frequency index by using
y = FrontPanel_wave_1st_transition_rise_time(data[0,::],base,top,base_threshold_pct,top_threshold_pct)

then the function gives me a value. Is there a way to make the frequency index as a variable so that i can get the rise time for each output?

It may be necessary to write a custom AEL function to call this rise time measurement function once for each input signal. There is information about writing custom AEL functions in the Knowledge Center:
http://edadocs.software.keysight.com/display/eesofkcads/Writing+custom+AEL+measurement+expressions

http://edadocs.software.keysight.com/display/eesofkcads/Custom+AEL+expressions+for+various+SIgnal+Integrity+%28High+Speed+Digital%29+applications

Thanks a lot! Will try it that way.

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