About DM

[José María García Pérez]

I am new to Casadi. I am trying to wrap a few things for the Nim programming  language.

I have started with the first example from the web but I am sttruggling with the last line (I understand just a little bit of C++):

// Evaluate numerically

std::vector<DM> grad_y_num = f(DM({1,2,3,4,5}));

From what I have seen:

typedef Matrix<double> DM;

What are the types above?:

1. DM({1,2,3,4,5}): the input is vector<double>? and the output just DM?

2. Why the outcome is std::vector<DM>?

Could you help me to point out the relevant constructors in the headers?

Then I can ask for help in the Nim forum for Nim's particularities.

Kind regards,

José M.

[José María García Pérez]

 I managed to compile the first example. Now I am trying to print the results.

I am trying to wrap `print_operator`. Is this the right function to wrap in order to get a string representation of DM content?

[José María García Pérez]

I finally gain access to DM using `get_elements`.

[joaosa...@gmail.com]

Not sure if it is what you are looking for, but I also had some doubts on how to use Functions.

Defining one (lets say sum two symbolic vectors)

//Defining the function

const auto &v_1 = casadi::SX::sym("x1",5,1); 
const auto &v_2 = casadi::SX::sym("x2",5,1); 
const SX &sum = v_1 + v_2;

auto f_ = Function("f", {v_1, v_2}, {sum});

// Using it

auto v1_dm = DM({1,2,3,4,5});

auto v2_dm = DM({5,4,3,2,1});

const auto &result = f_(std::vector<casadi::DM>{{v1_dm}, {v2_dm}});
result[0]