How to express inner product of two vectors in Stateflow action language?

I want to compute the inner product y of two vectors u and v (same size, both based on input from Simulink) in Stateflow action language. I have tried

x=ml.transpose(u)
y=ml.(x*v)

but during compilation this results in a coder error "Cannot reshape Local Data 'x' (#...) ([...]) to Local Data 'y' (#...) (scalar) for operator =. Please refer to object (#...)." Apparently, the "ml." notation only works with functions, not with operators such as '*'. Would there be a way to write a product as a function - something like y=ml.product(x,v)?

An alternative might be

x=ml.transpose(u)
y=ml('x*v')

but this requires x and v to be defined in the Matlab workspace, which would mean I have to export them first. This seems to be a rather laborious solution.

Any ideas?

[Wilfred]

I should have mentioned that both u and v are composed of integers. However, it seems that solutions are not available in that case, let's assume that u and v are composed of real numbers, as integers can of course also be converted to real numbers.

Answer 1

[Kaustubha Govind]

Try the function times for inner product of two vectors.

[Wilfred]

This was not exactly what I was looking for, but it helped me solve my problem. The function "times" multiplies input arrays element by element and puts these in a vector the same size as the input vectors (with no need for transposing one of them as I initially tried). What I wanted was a scalar equal to the sum of the element-by-element multiplications, which can of course be computed from it:

y=ml.sum(ml.times(u,v))

[Wilfred]

And, by the way, Thanks!!!

Answer 2

[Walter Roberson]

The MATLAB * operator has the formal name mtimes

[Wilfred]

Thanks, this works too, if put this way:

y=ml.mtimes(ml.transpose(u),v)

Here, the order of listing the arguments is important.