
November 8th, 2013, 05:31 PM
#1
Finding Lowest Value Of Every Column In A 2d Array
My array is such: (rows = 3, columns =7)
1 2 3 4 5 6 7
8 9 10 9 8 7 11
5 4 4 2 1 0 6
How can i make a method which displays the lowest value of every column while telling what row it is in?

November 8th, 2013, 05:50 PM
#2
Re: Finding Lowest Value Of Every Column In A 2d Array
This method will display the lowest of the whole array:
public static void findlowest(int[,] Data)
{
int min = Data[0, 0];
for (int r = 0; r < 3; r++)
{
for (int c = 0; c < 7; c++)
{
if (Data[r, c] < min)
{
min = Data[r, c];
}
}
}
Could i use that to get the three lowest values then compare those?

November 9th, 2013, 07:13 AM
#3
Re: Finding Lowest Value Of Every Column In A 2d Array
Code:
//.....
int[,] lol = new int[3, 7]{
{1, 2, 3, 4, 5, 6, 7},
{8, 9, 10, 9, 8, 7, 11},
{5, 4, 4, 2, 1, 0, 6}};
int[] min = Min2d(lol);
foreach (int x in min)
Console.WriteLine(x);
}
static int[] Min2d(int[,] a)
{
int[] min = new int[a.GetLength(0)];
for (int i = 0; i < a.GetLength(0); i++)
{
int[] c = new int[a.GetLength(1)];
for (int x = 0; x < a.GetLength(1); x++)
c[x] = a[i, x];
min[i] = c.Min();
}
return min;
}
This works for every column
Last edited by Reroto; November 9th, 2013 at 07:16 AM.

November 9th, 2013, 02:49 PM
#4
Re: Finding Lowest Value Of Every Column In A 2d Array
Originally Posted by Reroto
Code:
//.....
int[,] lol = new int[3, 7]{
{1, 2, 3, 4, 5, 6, 7},
{8, 9, 10, 9, 8, 7, 11},
{5, 4, 4, 2, 1, 0, 6}};
int[] min = Min2d(lol);
foreach (int x in min)
Console.WriteLine(x);
}
static int[] Min2d(int[,] a)
{
int[] min = new int[a.GetLength(0)];
for (int i = 0; i < a.GetLength(0); i++)
{
int[] c = new int[a.GetLength(1)];
for (int x = 0; x < a.GetLength(1); x++)
c[x] = a[i, x];
min[i] = c.Min();
}
return min;
}
This works for every column
How could i do that without using system.linq? We are not allowed to use it.
Also, when i tried linq, all i got was
"1
7
0"
Here is what i did:
Code:
using System;
using System.Linq;
public class Program
{
static void Main(string[] args)
{
int[,] Data = { { 1, 2, 3, 4, 5, 6, 7, }, { 8, 9, 10, 9, 8, 7, 11 }, { 5, 4, 4, 2, 1, 0, 6 } };
findlowest(Data);
findaverage(Data);
int[] min = Min2d(Data);
foreach (int x in min)
Console.WriteLine(x);
Console.ReadLine();
}
public static void findlowest(int[,] Data)
{
int mineatten = Data[0, 0];
int r;
for (r = 0; r < 3; r++)
{
for (int c = 0; c < 7; c++)
{
if (Data[r, c] < mineatten)
{
mineatten = Data[r, c];
}
}
}
//writeline
}
public static void findaverage(int[,] Data)
{
int sum = 0;
for (int r = 0; r < 3; r++)
{
for (int c = 0; c < 7; c++)
{
sum += Data[r, c];
}
}
//writeline
}
static int[]Min2d(int[,] a)
{
int Min;
int[] min = new int[a.GetLength(0)];
for (int i = 0; i < a.GetLength(0); i++)
{
int[] c = new int[a.GetLength(1)];
for (int x = 0; x < a.GetLength(1); x++)
c[x] = a[i, x];
min[i] = c.Min();
}
return min;
}
}
Last edited by wildcat1337; November 9th, 2013 at 02:59 PM.

November 9th, 2013, 03:48 PM
#5
Re: Finding Lowest Value Of Every Column In A 2d Array
Originally Posted by wildcat1337
How could i do that without using system.linq? We are not allowed to use it.
Why? It's not c++, it's c#, an advanced objectoriented language.
Anyway...
Code:
static int[] Min2d(int[,] a)
{
int[] min = new int[a.GetLength(0)];
for (int i = 0; i < a.GetLength(0); i++)
{
int[] c = new int[a.GetLength(1)];
for (int x = 0; x < a.GetLength(1); x++)
c[x] = a[i, x];
int mi = c[0];
foreach (int x in c)
mi = x < mi ? x : mi;
min[i] = mi;
}
return min;
}
These are the minimum numbers of each one
"1
7
0"
as you can see
Code:
{1, 2, 3, 4, 5, 6, 7} > 1
{8, 9, 10, 9, 8, 7, 11} > 7
{5, 4, 4, 2, 1, 0, 6} > 0
you mean something different?
Last edited by Reroto; November 9th, 2013 at 03:54 PM.

November 9th, 2013, 04:59 PM
#6
Re: Finding Lowest Value Of Every Column In A 2d Array
Originally Posted by Reroto
Why? It's not c++, it's c#, an advanced objectoriented language.
Anyway...
Code:
static int[] Min2d(int[,] a)
{
int[] min = new int[a.GetLength(0)];
for (int i = 0; i < a.GetLength(0); i++)
{
int[] c = new int[a.GetLength(1)];
for (int x = 0; x < a.GetLength(1); x++)
c[x] = a[i, x];
int mi = c[0];
foreach (int x in c)
mi = x < mi ? x : mi;
min[i] = mi;
}
return min;
}
These are the minimum numbers of each one
"1
7
0"
as you can see
Code:
{1, 2, 3, 4, 5, 6, 7} > 1
{8, 9, 10, 9, 8, 7, 11} > 7
{5, 4, 4, 2, 1, 0, 6} > 0
you mean something different?
our professor will not allow us to use linq. Part of the reason I have a hard time figuring it out as Im fairly new to programming.
Your code also displays the lowest value of each row, I need to find each lowest of each column along with what row has it, should display this:
1 from row 1
2 from row 1
3 from row 1
2 from row 3
1 from row 3
0 from row 3
6 from row 3

November 9th, 2013, 05:19 PM
#7
Re: Finding Lowest Value Of Every Column In A 2d Array
Originally Posted by wildcat1337
our professor will not allow us to use linq. Part of the reason I have a hard time figuring it out as Im fairly new to programming.
Your code also displays the lowest value of each row, I need to find each lowest of each column along with what row has it, should display this:
1 from row 1
2 from row 1
3 from row 1
2 from row 3
1 from row 3
0 from row 3
6 from row 3
That's it
Code:
static int[] Min2d(int[,] a)
{
int rows = a.GetLength(0);
int columns = a.GetLength(1);
int[] min = new int[columns];
for (int i = 0; i < columns; i++)
{
int[] nums = new int[rows];
for (int x = 0; x < rows; x++)
nums[x] = a[x, i];
int mi = nums[0];
foreach (int x in nums)
mi = x < mi ? x : mi;
min[i] = mi;
}
return min;
}

November 9th, 2013, 09:19 PM
#8
Re: Finding Lowest Value Of Every Column In A 2d Array
Originally Posted by Reroto
That's it
Code:
static int[] Min2d(int[,] a)
{
int rows = a.GetLength(0);
int columns = a.GetLength(1);
int[] min = new int[columns];
for (int i = 0; i < columns; i++)
{
int[] nums = new int[rows];
for (int x = 0; x < rows; x++)
nums[x] = a[x, i];
int mi = nums[0];
foreach (int x in nums)
mi = x < mi ? x : mi;
min[i] = mi;
}
return min;
}
I can display the min value, but how to display the row it is in?

November 9th, 2013, 10:07 PM
#9
Re: Finding Lowest Value Of Every Column In A 2d Array
Originally Posted by wildcat1337
I can display the min value, but how to display the row it is in?
Ultimate edition xD
Code:
public static void Main()
{
int[,] lol = new int[3, 7]{
{1, 2, 3, 4, 5, 6, 7},
{8, 9, 10, 9, 8, 7, 11},
{5, 4, 4, 2, 1, 0, 6}};
int[,] min = Min2d(lol);
for (int i = 0; i < min.GetLength(1); i++)
Console.WriteLine("Row: {0}, Column: {1}, Value: {2}", min[0, i], i + 1, min[1, i]);
Console.ReadKey();
}
static int[,] Min2d(int[,] a)
{
int rows = a.GetLength(0);
int columns = a.GetLength(1);
int[,] min = new int[2,columns];
for (int i = 0; i < columns; i++)
{
int[] nums = new int[rows];
for (int x = 0; x < rows; x++)
nums[x] = a[x, i];
int row = 0;
for (int s = 0, mi=nums[0]; s < rows; s++)
{
if (nums[s] < mi)
{
mi = nums[s];
row = s;
}
}
min[0, i] = row+1;
min[1, i] = nums[row];
}
return min;
}
Last edited by Reroto; November 9th, 2013 at 10:09 PM.
Posting Permissions
 You may not post new threads
 You may not post replies
 You may not post attachments
 You may not edit your posts

Forum Rules

Click Here to Expand Forum to Full Width
This is a Codeguru.com survey!
