I would really appreciate if someone could take a look and give some advice or h

Question

I would really appreciate if someone could take a look and give some advice or help.

I got a 2D array and based on it I can figure out a value based only on those coordinates. What I am trying to do though is to use a y=mx+b equation to find the values in between the points. I am having lots of issues writing a code that would say, figure out the value of the two closest points (that surround the value).

For example if I have-

a graph associated with the array that looks like this:

Then in code this is:

array[4][5] = { {1, 2, 3, 4, 5} }
{ {3, 5, 8, 10, 14} }
{ {5, 7, 12, 16, 19} }
{ {8, 9, 13, 18, 23} }

// I can plug in indirectly for points using-

if (x=1)
{a=0}
if (x=2)
{a=1}
if (x=4)
{a=2}
if (x =6)
{a=3}


b = y-3

cout << array[a][b];


But if I plug in, for example, x=4.7 and y = 6, how should I write a code that would figure out that 4.7 is between x=4 and x=6 or between a =2 and a=3 and then take the coordinates at x=4 or 6 or a=2 or 3 and plug it into an y=mx+b equation?

Explanation / Answer

As the values stored in aray are integers.... so rather selecting by single value...select by range

so change your if conditions set like this

if (x>=1.0 && x<1.5)
{a=0}
if (x>=1.5 && x<=2)
{a=1}
if (x>=2 && x<4.5)
{a=2}
if (x>=4.5 && x=6)
{a=3}

so that any numbers given we can get exact value between boundary given

Before this we have to cast int to float

x=(float)x;

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