GaussianRandomNumber
vtk-examples/Cxx/SimpleOperations/GaussianRandomNumber
Description¶
This example generates 3 random numbers from a Gaussian distribution with mean 0.0 and standard deviation 2.0.
Other languages
See (CSharp)
Question
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Code¶
GaussianRandomNumber.cxx
#include <time.h>
#include <vtkMath.h>
int main(int, char*[])
{
// The number of random numbers we wish to produce
unsigned int numRand = 3;
// without this line, the random numbers will be the same every iteration
vtkMath::RandomSeed(time(NULL));
// Generate numRand random numbers from a Gaussian distribution with mean 0.0
// and standard deviation 2.0
for (unsigned int i = 0; i < numRand; i++)
{
double a = vtkMath::Gaussian(0.0, 2.0);
std::cout << a << std::endl;
}
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(GaussianRandomNumber)
find_package(VTK COMPONENTS
vtkCommonCore
QUIET
)
if (NOT VTK_FOUND)
message("Skipping GaussianRandomNumber: ${VTK_NOT_FOUND_MESSAGE}")
return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE})
add_executable(GaussianRandomNumber MACOSX_BUNDLE GaussianRandomNumber.cxx )
target_link_libraries(GaussianRandomNumber PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(GaussianRandomNumber MACOSX_BUNDLE GaussianRandomNumber.cxx )
target_link_libraries(GaussianRandomNumber PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS GaussianRandomNumber
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build GaussianRandomNumber¶
Click here to download GaussianRandomNumber and its CMakeLists.txt file. Once the tarball GaussianRandomNumber.tar has been downloaded and extracted,
cd GaussianRandomNumber/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./GaussianRandomNumber
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.