Use of integrate without explicit function - defined by variable

Dear All,

I would like to integrate something which is not defined by a function (anoymous or otherwise. The 'function' is defined by a set of values iod a varable (y) at a number of points defined in another variable (x). I want to integate y with respect to x.

Is there some way of doing this? Graphically I could plot y against x and find the area under the graph. Is this the way I ahould do it using Matalb or is there something more sophisticated?

All help will be welcome.

John

Answer 1

[madhan ravi]

doc cumtrapz

[John Hey]

Dear Madhan,

That is great. Many, many thanks.

After posting this question, I discovered trapz. Is cumtrapz different?

John

[madhan ravi]

cumulative kntegral

[John Hey]

Dear Madhan, I think I understand, but trapz does perfectly what I want. Thanks.