find the corresponding x and y coordinates

Hello,

Can some one help me find the "i" th value inside a [x,y] grid and get the coordinations of that?

Eg:

x are longitudes (columns); from -175:0.02:-179

y are latitudes (rows): from 10:0.02:20

I need to find the latitude and longitude coordinate of 100th grid node.

How can I do that?

Thank you

[Torsten]

The x-vector is empty since -175 > -179.

In which order do you count the grid nodes ? Rowwise or columnwise ?

[Anitha Limann]

I want to start from -175 and to go -179 (west longitudes)

then -10 to go to -20. (south latitudes)

Attached here is an example grid.

[Torsten]

Do you want to go

1st grid point: -179 -20

2nd grid point: -179.02 -20

3rd grid point: -179.04 -20

...

or

1st grid point: -179 -20

2nd grid point: -179 -19.98

3rd grid point: -179 -19.96

...

Note that you should always go from low to high in each direction (thus from -179 to -175 and -20 to -10), not vice versa.

Answer 1

[Matt J]

i=100;

x=-179:0.02:-175;
y=10:0.02:20;

[j,k]=ind2sub([numel(x),numel(y)],  i);

xi=x(j)

xi = -177.0200

yi=y(k)

yi = 10

[Anitha Limann]

gives me error below

Not enough input arguments.

Error in ind2sub (line 45)
    vi = rem(ndx-1, siz(1)) + 1;