How to find the max value of group of arrays

Question

Hi I have six arrays which is of float type. Any specific index in all these arrays represent set of values for me. Ex: if index is zero all the six arrays zeroth index represent a set of values from which i need to find the max value. similarly for all other indexes. array1 array2 array3 array4 array5 array6 0 0 0 0 0 0 1 1 1 1 1 1 -------------------------------------so on i need to find out which is the max value of a specific index among all these arrays and should store it in another array or list

Vulpes · Answer

This code should do it: #include stdafx.h using namespace System; float GetMaximum(array ^ array) { float max = Single::MinValue; for each(float f in array) { if (f > max) max = f; } return max; } int main(array ^args) { array ^ array1 = {1 2 3 4 5 6}; array ^ array2 = {7 8 9 1 2 3}; array ^ array3 = {1 2 3 10 11 12}; array ^ array4 = {-1 -2 -3 -4-5 -6}; array ^ array5 = {-7 -8 -9 -3 -4 -5}; array ^ array6 = {4 5 6 -1 -2 -3}; array ^ maxima = gcnew array (6); maxima[0] = GetMaximum(array1); maxima[1] = GetMaximum(array2); maxima[2] = GetMaximum(array3); maxima[3] = GetMaximum(array4); maxima[4] = GetMaximum(array5); maxima[5] = GetMaximum(array6); // check it worked Console::WriteLine(The maxima are 
); for each(float f in maxima) Console::WriteLine(f); Console::ReadKey(); return 0; }

Vulpes · Answer

Just realized that I've programmed the wrong problem! Instead of generating an array consisting of the maxima of the other 6 arrays you asked for an array whose i'th element contains the maxima of the i'th elements of the other 6 arrays. With apologies for the confusion here's the revised code: #include stdafx.h using namespace System; array ^ GetMaxima(array ^>^ arrayOfArrays) { array ^ maxima = gcnew array (arrayOfArrays[0]->Length); for(int i = 0; i Length; i++) { float max = Single::MinValue; for(int j = 0; j Length; j++) { if (arrayOfArrays[j][i] > max) max = arrayOfArrays[j][i]; } maxima[i] = max; } return maxima; } int main(array ^args) { array ^ array1 = {1 2 3 4 5 6}; array ^ array2 = {7 8 9 1 2 3}; array ^ array3 = {1 2 3 10 11 12}; array ^ array4 = {-1 -2 -3 -4-5 -6}; array ^ array5 = {-7 -8 -9 -3 -4 -5}; array ^ array6 = {4 5 6 -1 -2 -3}; array ^>^ arrayOfArrays = {array1 array2 array3 array4 array5 array6}; array ^ maxima = GetMaxima(arrayOfArrays); // check it worked Console::WriteLine(The maxima are 
); for each(float f in maxima) Console::WriteLine(f); Console::ReadKey(); return 0; }

Vulpes · Answer

Although the OP hasn't asked for it I agree that it would be better to use a 2D array rather than 6 single dimensional arrays. Here's the C++/CLI code for that: #include stdafx.h using namespace System; array ^ GetMaxima(array ^ array2D) { array ^ maxima = gcnew array (array2D->GetLength(0)); for(int i = 0; i GetLength(0); i++) { float max = Single::MinValue; for(int j = 0; j GetLength(1); j++) { if (array2D[i j] > max) max = array2D[i j]; } maxima[i] = max; } return maxima; } int main(array ^args) { array ^ array2D = { {1 2 3 4 5 6} {7 8 9 1 2 3} {1 2 3 10 11 12} {-1 -2 -3 -4-5 -6} {-7 -8 -9 -3 -4 -5} {4 5 6 -1 -2 -3} }; array ^ maxima = GetMaxima(array2D); // check it worked Console::WriteLine(The maxima are 
); for each(float f in maxima) Console::WriteLine(f); Console::ReadKey(); return 0; }

Sam Hobbs · Answer

I hope that Karthik answers my question so we don't need to speculate. Using managed code it is relevant to suggest use of a two-dimensional array. I assume there is an array operation that could be used but even a simple foreach would help but certainly (I assume) LINQ could be used with a two-dimensional array. Using the C++ Standard Library it is possible to use a vector of vectors and perhaps a member of the Members (Standard C++ Library) would help. Also for C++ the Boost web site has an abundance of additional classes that can help. The Boost web site says that ten of the Boost libraries are in the new C++ standard. So it is likely that it is possible to use a library that is even more mature than the existing C++ Standard Library to write code now that will be compatible with the new standard.

Vulpes · Answer

Suthish The only ones I'm reasonably fluent in nowadays are C# C++ and VB though I have used several others in my time. Sam Judging by the OP's previous thread he's using C++/CLI.

Sam Hobbs · Answer

Suthish: Depending on the definition of  know  and  language  I know many languages. I won't get into that here since it is off-topic.

Sam Hobbs · Answer

Do you need managed or unmanaged code? Is this a class assignment? It sure sounds like one. You might consider making a two-dimensional array and then you can use existing methods to access the set of values instead of writing a line of code for each one of the six values.

Suthish Nair · Answer

Hi Vulpes How are you.. How many languages you knows :)

Jaganathan Bantheswaran · Answer

Hi Store those specific index values in one array and compare that array value.