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all in Matlab |
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all
Determine whether all array elements are nonzero Syntax B = all(A) B = all(A, dim) Description B = all(A) tests whether all the elements along various dimensions of an array are nonzero or logical 1 (true). If A is a vector, all(A) returns logical 1 (true) if all the elements are nonzero and returns logical 0 (false) if one or more elements are zero. If A is a matrix, all(A) treats the columns of A as vectors, returning a row vector of logical 1's and 0's. If A is a multidimensional array, all(A) treats the values along the first nonsingleton dimension as vectors, returning a logical condition for each vector. B = all(A, dim) tests along the dimension of A specified by scalar dim. Examples Given A = [0.53 0.67 0.01 0.38 0.07 0.42 0.69] then B = (A < 0.5) returns logical 1 (true) only where A is less than one half: 0 0 1 1 1 1 0 The all function reduces such a vector of logical conditions to a single condition. In this case, all(B) yields 0. This makes all particularly useful in if statements: if all(A < 0.5) do something end where code is executed depending on a single condition, not a vector of possibly conflicting conditions. Applying the all function twice to a matrix, as in all(all(A)), always reduces it to a scalar condition. all(all(eye(3))) ans = 0 See Also any, logical operators (elementwise and short-circuit), relational operators, colon Other functions that collapse an array's dimensions include max, mean, median, min, prod, std, sum, and trapz. Add by Pancho You can edit it here |
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| Birth of a Hurricane
Summer storms are a regular feature in the North Atlantic, and while most pose little threat to our shores, a choice few become devastating hurricanes. To decipher which storms could bring danger, and which will not, atmospheric scientists are heading to the tropics to observe these systems as they form and dissipate--or develop into hurricanes. By learning to identify which weather systems are the most critical to track, the efforts may ultimately allow for earlier hurricane ...
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