jalec
fa03862cee
sort, reorder vectors and eigen (dynamic) matrices like matlabs sort (with example)
function to retrieve shader uniform names and locations,
function to report open gl errors to stderr
example that prints opengl version and glsl version,
Former-commit-id: 729936710f
70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
// g++ -o main main.cpp -I. -I/usr/local/include/eigen3
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#include <Eigen/Core>
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#include <iostream>
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using namespace std;
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#include "sort.h"
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using namespace igl;
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template <typename T>
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void matlab_print(const string name, const T & X)
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{
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cout<<name<<"=["<<endl<<X<<endl<<"];"<<endl;
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}
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int main(int argc, char * argv[])
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{
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Eigen::MatrixXd X(2,3);
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X << 3,5,2,1,3,8;
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matlab_print("X",X);
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// sort each row independently
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int dim = 2;
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// sort ascending order
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int ascending = true;
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// Sorted output matrix
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Eigen::MatrixXd Y;
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// sorted indices for sort dimension
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Eigen::MatrixXi IX;
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sort(X,dim,ascending,Y,IX);
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matlab_print<Eigen::MatrixXd>("Y",Y);
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matlab_print<Eigen::MatrixXi>("IX",IX);
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// Verify that IX really does sort X into Y
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int num_outer = (dim == 1 ? X.cols() : X.rows() );
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// get number of rows (or columns)
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int num_inner = (dim == 1 ? X.rows() : X.cols() );
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bool verified = true;
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for(int i = 0;i<num_outer;i++)
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{
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for(int j = 0;j<num_inner;j++)
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{
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if(dim == 1)
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{
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if( Y(j,i) != X(IX(j,i),i))
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{
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printf("Y(%d,%d) = %g != %g = X(%d,%d) = X(IX(%d,%d),%d)\n",
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j,i,Y(j,i),X(IX(j,i),i),IX(j,i),i,j,i,i);
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verified = false;
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}
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}else
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{
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if( Y(i,j) != X(i,IX(i,j)))
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{
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printf("Y(%d,%d) = %g != %g = X(%d,%d) = X(IX(%d,%d),%d)\n",
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i,j,Y(i,j),X(i,IX(i,j)),IX(i,j),i,i,j,i);
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verified = false;
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}
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}
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}
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}
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if(verified)
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{
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printf("Sorting succeeded\n");
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}else
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{
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printf("Sorting failed\n");
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}
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return (verified?0:1);
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}
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