How to compute integral when one of the limits is a vector

Question

Maurilio Matracia 2020-9-21

评论： Ameer Hamza 2020-9-21

Hello everyone,

I am trying to use the function integral to evaluate a function handle in a vector, such as:

FunctionToEvaluate = @(x) integral(@(z) z.^2+1, 0, x, 'ArrayValued',1) 
EvaluatedFunction = FunctionToEvaluate([1 2 3])

but I am getting an error saying:

Error using integral (line 85)

A and B must be floating-point scalars.

Is there any way to avoid this error and evaluate the function in a vector?

Thank you in advance for your help!

Answer 1

Ameer Hamza 2020-9-21

编辑：Ameer Hamza 2020-9-21

If you want to use all the points in x as the limits one after the other, then following is the way to do that

FunctionToEvaluate = @(x) arrayfun(@(x_) integral(@(z) z.^2+1, 0, x_) , x);
EvaluatedFunction = FunctionToEvaluate([1 2 3])

Result

>> EvaluatedFunction
EvaluatedFunction =
    1.3333    4.6667   12.0000

That's great, thank you very much!

Ameer Hamza 2020-9-21

I am glad to be of help!