how to use ksdensity function

Hello Everybody,

i apologize in advance i am a noob and i need your help.

I would like to calculate the spike density of my neuron and I have my matrix where each row is a trial.

Whenever a spike of the neuron appears, the time at which the spike occurred is written, for example:

x = [-454 -65 3 56 134; -498 -334 -222 12 45; -111 -12 2 14 98].

I can't understand which vector I should put inside the ksdensity function. Also I would like the times to go from one value to another prefixed: ex: from -1500ms to 3500ms

thank you very much