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 Post subject: How to use in c++ the function rmatrixlu, it doesn't work
PostPosted: Tue Feb 01, 2022 12:18 pm 
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Joined: Tue Feb 01, 2022 12:03 pm
Posts: 4
Hello, I'm trying to using alglib in c++. But I haven't get use it. I'm trying use the function rmatrixl.

Firstly I have added the src folder to my copilator. (Dev-C++) And then, I have added the files .h to my .cpp file, using include: #include "....h" with all files .h. And I have written :

void alglib::rmatrixlu(A,n,n,p,const xparams _params = alglib::xdefault);

When A is my initial matrix, n is its dimension , and p is a one dimension vector with dimension n. But it doesn't work. It say :

[Error] qualified-id in declaration before '(' token

Can you help me, please??


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 Post subject: Re: How to use in c++ the function rmatrixlu, it doesn't wor
PostPosted: Wed Feb 02, 2022 11:48 am 
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Joined: Fri May 07, 2010 7:06 am
Posts: 880
Hi!

It should be
Code:
alglib::rmatrixlu(A,n,n,p);


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 Post subject: Re: How to use in c++ the function rmatrixlu, it doesn't wor
PostPosted: Thu Feb 03, 2022 7:25 pm 
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Joined: Tue Feb 01, 2022 12:03 pm
Posts: 4
Thank you

But now I have other problem, There is other error :

I have written :

int main(){
double A[2][2]={{1.,2.},{3.,4.}};
int p[2];
int n=2;

alglib::rmatrixlu(A,n,n,p);
}

But it's say [Error] invalid initialization of reference of type 'alglib::real_2d_array&' from expression of type 'double[2][2]'

How could it be solve??


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 Post subject: Re: How to use in c++ the function rmatrixlu, it doesn't wor
PostPosted: Thu Feb 03, 2022 9:33 pm 
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Site Admin

Joined: Fri May 07, 2010 7:06 am
Posts: 880
Code:
alglib::real_2d_array A="[[1,2],[3,4]]";


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 Post subject: Re: How to use in c++ the function rmatrixlu, it doesn't wor
PostPosted: Sat Feb 05, 2022 5:42 pm 
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Joined: Tue Feb 01, 2022 12:03 pm
Posts: 4
Thank you, but I have other mistake,

I have written:

int main(){

alglib::real_2d_array A="[[1,2],[3,4]]";
alglib::ae_int_t n="2";
alglib::integer_1d_array p="";

alglib::rmatrixlu(A,n,n,p);

}

But it's says: [Error] invalid conversion from 'const char* to 'alglib::ae_int_t'{aka 'long long int'} [-fpermissive]


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