Find coordinates

Input a value and a matrix, and this function will output the row(s) and column(s) of the value.

Description

getcoord(value,matrix)
This function finds the value inside of a matrix containing it. Imput first the value, then the matrix, and the output will be in the form of a vector [r c] with r being the row of the value and c being the column. If the value is present multiple times, the output will be have more rows of [r c]. You can also type in the function in the form getcoord(COORDVAL, MATRIX, RANGEROW, RANGECOL)
where rangerow and rangecol are vectors of integers less than or equal to the dimension of the matrix. This simply finds the value or values in the specified area.

• MATLAB release: MATLAB 6.5.1 (R13SP1)

[Jos x]

The very very basic command
[r,c] = find(M=V)
will do the same thing, and much quicker !

[majj maha]

I agree with Jos x

[Robert Young]

MatLab command find already does this.

[ciccio balu]

it may be of some interest if you extend to N-dimensional matrices

indded matlab [i,j] = find(..) works only with 2d matrice

matlab does not [i,j,k]=find(...)

[K Morton]

Finally! I really needed a less general find.

[Jos x]

Generalized find:
M is your N-dimensional matrix
V is your value
clear ind ; [ind{1:ndims(M)}] = ind2sub(size(M),find(M=V))

[Jos x]

Sorry, M==V instead of M=V
clear ind ; [ind{1:ndims(M)}] = ind2sub(size(M),find(M==V))

[Chris Riederer]

Thanks guys, I didn't realize you could use the find( command that way. This will help speed up some of my programs.

[Them Them]

 

[Demyan .]

Duplicates built-in FIND.

[noam zick]

the city hall of philadelphia

[Arnaud Laurent]

use [r c] = find(matrix,value) instead.

[Vanessa]

 

[Vanessa]

Thank you for this useful piece of code. I needed something that would search through a matrix and return the location of the number -9999. The find function in Matlab could not do this. According to the help file the find function will "Find indices and values of nonzero elements". Thanks again!