How can I get minimum value in two dimensional array for given index?

Question

double[] tab = new double[10];

I know I can gen minimum by tab.Min().

double[,] tab = new double[10,2];

This is table of coordinates, in 2nd index 0 is x and 1 is y. There are 10 points.

How can I get minimum (and maximum) value of x and y?

In other words:

minX is the smallest value in 1st column (second index=0 e.g tab[xxx, 0]);
minY is the smallest value in 2nd column (second index=1 e.g tab[xxx, 1]);

I'm not sure what you are trying to get. You want the smallest pair (x,y) -- i.e., closest to the origin or are you trying to get the boundaries of the region -- min/max in each coordinate? — tvanfosson
– tvanfosson, Commented Jan 9, 2011 at 21:26
Point[] tab = new Point[10]; That's an array of coordinates. — Hans Passant
– Hans Passant, Commented Jan 9, 2011 at 21:27
@Jani - why do you say that? He says he wants minimum (and maximum) value of x and y. I'm just not sure whether he wants the length of each vector or is looking for the vectors with the min/max components in x and y. — tvanfosson
– tvanfosson, Commented Jan 9, 2011 at 21:33
Seems that I didn't understand it completely, lets wait till the OP clarify about what he wants — Jahan Zinedine
– Jahan Zinedine, Commented Jan 9, 2011 at 21:44

Jahan Zinedine · Accepted Answer · 2011-01-09 21:25:46Z

7

var doubles = new double[4,2]{{1,2},{4,5},{7,8},{9,1}};
var min = System.Linq.Enumerable.Range(0, 4).Select(i => doubles[i, 1]).Min();

OR

var doubles = new double[4,2]{{1,2},{4,5},{7,8},{9,1}};
var min = System.Linq.Enumerable.Range(0, doubles.GetUpperBound(0)+1)
                                .Select(i => doubles[i, 1]).Min();

edited Jan 9, 2011 at 21:25

answered Jan 9, 2011 at 21:19

Jahan Zinedine

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Comments

abatishchev · Accepted Answer · 2011-01-09 22:05:45Z

0

double minX = tab[0,0], minY = tab[0,1];
String coordinate = "X";

foreach (double number in tab)
{
    if (coordinate == "X")
    {
        if(number < minX)
            minX = number;

        coordinate = "Y";
    }
    else if (coordinate == "Y")
    {
        if (number < minY)
            minY = number;

        coordinate = "X";
    }
}

edited Jan 9, 2011 at 22:05

abatishchev

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answered Jan 9, 2011 at 21:19

user1234567

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1 Comment

Miko Kronn Over a year ago

Instead of string coordinade I would use int index=0 and change it later to 1. I wanted to do this in similiar way to tab.Min(). I want that I can check each element in search for minimum.

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