# How does ind2sub work in MATLAB?

## How does ind2sub work in MATLAB?

The ind2sub command determines the equivalent subscript values corresponding to a single index into an array. [I,J] = ind2sub(siz,IND) returns the matrices I and J containing the equivalent row and column subscripts corresponding to each linear index in the matrix IND for a matrix of size siz .

### What is sub2ind in MATLAB?

Description. The sub2ind command determines the equivalent single index corresponding to a set of subscript values. IND = sub2ind(siz,I,J) returns the linear index equivalent to the row and column subscripts I and J for a matrix of size siz .

How do you find the minimum value in MATLAB?

x = fminbnd( problem ) finds the minimum for problem , where problem is a structure. [ x , fval ] = fminbnd(___) , for any input arguments, returns the value of the objective function computed in fun at the solution x .

How do you write summation in MATLAB?

F = symsum( f , k , a , b ) returns the sum of the series f with respect to the summation index k from the lower bound a to the upper bound b . If you do not specify k , symsum uses the variable determined by symvar as the summation index. If f is a constant, then the default variable is x .

## What does [I1] = ind2sub(SZ) mean?

Here sz is a vector with two elements, where sz (1) specifies the number of rows and sz (2) specifies the number of columns. [I1,I2,…,In] = ind2sub (sz,ind) returns n arrays I1,I2,…,In containing the equivalent multidimensional subscripts corresponding to the linear indices ind for a multidimensional array of size sz.

### What is the output size of ind2sub in Python?

If you specify only two output arguments, ind2sub ignores the third dimension of the array and returns subscripts for a 2-dimensional array with size 2-by-4 instead. If you specify only one output argument, ind2sub ignores the second and third dimensions of the array and returns subscripts for a 1-dimensional array with size 1-by-8 instead.

Why are my index versions different when using ind2sub?

Check that both index versions refer to the same element of the array. When using ind2sub for an N-dimensional array, you would typically supply N output arguments for each dimension of the matrix. This example shows the different results when you return fewer output arguments for a 3-dimensional array.

How do you find the indices of a matrix in MATLAB?

To get the linear indices of matrix elements that satisfy a specific condition for matrix A, you can use the find function with one output argument. To get the subscript indices, use the find function with two output arguments. For example, [row,col] = ind2sub (size (A),find (A>5)) gives the same result as [row,col] = find (A>5).