92 lines
2.8 KiB
Markdown
92 lines
2.8 KiB
Markdown
# Init
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Initialize a matrix or a vector.
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```
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void matrix::Init(
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const ulong rows, // number of rows
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const ulong cols, // number of columns
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func_name init_func=NULL, // init function placed in some scope or static method of class
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... parameters
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);
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void vector::Init(
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const ulong size, // vector size
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func_name init_func=NULL, // init function placed in some scope or static method of class
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... parameters
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);
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```
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Parameters
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rows
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[in] Number of rows.
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cols
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[in] Number of columns.
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func_name
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[in] Initializing function.
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...
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[in] Parameters of the initializing function.
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Return Value
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No return value.
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Example
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```
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template<typename T>
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void MatrixArange(matrix<T> &mat,T value=0.0,T step=1.0)
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{
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for(ulong i=0; i<mat.Rows(); i++)
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{
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for(ulong j=0; j<mat.Cols(); j++,value+=step)
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mat[i][j]=value;
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}
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}
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template<typename T>
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void VectorArange(vector<T> &vec,T value=0.0,T step=1.0)
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{
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for(ulong i=0; i<vec.Size(); i++,value+=step)
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vec[i]=value;
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}
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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//---
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int size_m=3, size_k=4;
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matrix m(size_m,size_k,MatrixArange,-2.,0.1); // first an uninitialized matrix sized size_m x size_k is created,
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Print("matrix m \n",m); // then function MatrixArange with the parameters listed at initialization is called
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matrixf m_float(5,5,MatrixArange,-2.f,0.1f); // after a matrix of float type is created, the MatrixArange function is called
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Print("matrix m_float \n",m_float);
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vector v(size_k,VectorArange,-10.0); // after a vector is created, VectorArange with one parameter is called; its second parameter is the default
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Print("vector v \n",v);
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/*
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matrix m
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[[-2,-1.9,-1.8,-1.7]
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[-1.6,-1.5,-1.399999999999999,-1.299999999999999]
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[-1.199999999999999,-1.099999999999999,-0.9999999999999992,-0.8999999999999992]]
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matrix m_float
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[[-2,-1.9,-1.8,-1.6999999,-1.5999999]
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[-1.4999999,-1.3999999,-1.2999998,-1.1999998,-1.0999998]
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[-0.99999976,-0.89999974,-0.79999971,-0.69999969,-0.59999967]
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[-0.49999967,-0.39999968,-0.29999968,-0.19999969,-0.099999689]
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[3.1292439e-07,0.10000031,0.20000032,0.30000031,0.4000003]]
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vector v
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[-10,-9,-8,-7]
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*/
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}
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```
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