how to plot spikes?

bsd
2011 9 19
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Hai,
I have a 3 dimensional graph. I need to plot spikes at required points. How is this possible in matlab? Looking forward to hearing from you soon.
BSD

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the cyclist
the cyclist 2011-9-19
Your original question was very brief, and in the comments below you are trickling out very small amounts of information about what you want. Might I suggest you try to create a more detailed question with ALL the information about what you want, and what you tried, so that we do not waste everyone's time trying to guess?

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Michael Leung
Michael Leung 2011-9-19

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I'm not sure what kind of "spikes" you are looking for, but the simplest way I can think of is to create a matrix of data, with a 2d gaussian centered at where you want your "spike" to be located, and then add them all up before plotting.
if you want your spikes sharper (taller and thinner), just decrease the standard deviation.

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bsd
bsd 2011-9-19
I meant, instead of using stem() at required points on the 3d graph, is there any command which plots a spike (which would something look like a cone or a pyramid structure or a similar one) at the required points.
BSD
Image Analyst
Image Analyst 2011-9-19
How about surf()?
bsd
bsd 2011-9-19
I have tried surf, it gives a planar peak(spike), but not a volumetric peak(spike).

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2011-9-19

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