You only need to indicate ‘last’ if you want it the other way around. How to find the first index where value is?įrom Matlab documentation: I = FIND (X,K,’first’) is the same as I = FIND (X,K). So % random data a = rand (10^7, 1) % threashold – how much data meets the a>threashold criterion % This determines the total indexing time – the more data we extract from a, % the longer it takes. You use sum, which allows you to get the number of elements with one command: Do you really need explicit indices? Because the logical matrix A>5 can also be used as index (usually a tad more efficient than indexing with find ): For completeness: indexing with logicals is the same as with regular indices: How to calculate the number of values greater than a threshold? The test compares only the real part of numeric arrays.ĭo you really need explicit indices in MATLAB? How to determine greater than B in MATLAB?Ī > B returns a logical array with elements set to logical 1 (true) where A is greater than B otherwise, the element is logical 0 (false). In nested loops, break exits only from the loop in which it occurs. Statements in the loop after the break statement do not execute. Is equal to MATLAB?īreak terminates the execution of a for or while loop. Index matrices are useful for mapping observations to unique covariate values, for example. If A is a matrix, then max(A) is a row vector containing the maximum value of each column.Īn index matrix is a matrix with exactly one non-zero entry per row. If A is a vector, then max(A) returns the maximum of A. M = max( A ) returns the maximum elements of an array. This syntax is especially useful when working with sparse matrices. If none are found, find returns an empty, 0-by-1 matrix. What does find return if nothing is found MATLAB? If you only need the position of one occurrence, you could use the syntax “find(a=8,1)”.Ī >= B creates the condition greater than or equal.To get the row and column indices separately, use:.You can use the “find” function to return the positions corresponding to an array element value.How do I find a certain value in an array in Matlab?
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