How do you find the index of a matrix element in MATLAB?

k = find( X ) returns a vector containing the linear indices of each nonzero element in array X .

If X is a vector, then find returns a vector with the same orientation as X .
If X is a multidimensional array, then find returns a column vector of the linear indices of the result.

How do you make a logical matrix in MATLAB?

Description. L = logical( A ) converts A into an array of logical values. Any nonzero element of A is converted to logical 1 ( true ) and zeros are converted to logical 0 ( false ). Complex values and NaNs cannot be converted to logical values and result in a conversion error.

What is a logical array MATLAB?

This data type represents true and false states using the numbers 1 and 0 , respectively. Certain MATLAB functions and operators return logical values to indicate fulfillment of a condition. You can use those logical values to index into an array or execute conditional code.

What are logical operators in MATLAB?

The logical operators return a logical array with elements set to true ( 1 ) or false ( 0 ), as appropriate. The & operator does a logical AND , the | operator does a logical OR , and ~A complements the elements of A . The function xor(A,B) implements the exclusive OR operation.

What is logical function MATLAB?

True or false conditions. MATLAB® represents Boolean data using the logical data type. This data type represents true and false states using the numbers 1 and 0 , respectively. Certain MATLAB functions and operators return logical values to indicate fulfillment of a condition.

Does MATLAB indexing start at 1?

In most programming languages, the first element of an array is element 0. In MATLAB, indexes start at 1. Arrays can be sliced by using another array as an index.

How do you make a matrix in MATLAB?

If the size of any dimension is 0,then X is an empty array.

If the size of any dimension is negative,then it is treated as 0.

Beyond the second dimension,zeros ignores trailing dimensions with a size of 1. For example,zeros ([3 1 1 1]) produces a 3-by-1 vector of zeros.

What are indices MATLAB?

If X is a row vector,then k is also a row vector. Otherwise,k is a column vector.

k is an empty row vector or empty column vector when X is an empty array or has no nonzero elements.

find uses the convention that k is an empty matrix[]when X is an empty matrix[].

How to do array indexing MATLAB?

Another method for accessing elements of an array is to use only a single index, regardless of the size or dimensions of the array. This method is known as linear indexing. While MATLAB displays arrays according to their defined sizes and shapes, they are actually stored in memory as a single column of elements.

How to find index of element in array in MATLAB?

To find array elements that meet a condition,use find in conjunction with a relational expression.

To directly find the elements in X that satisfy the condition X<5,use X (X<5) .

When you execute find with a relational operation like X>1,it is important to remember that the result of the relational operation is a logical matrix of ones and zeros.