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Determine if input is tall array


tf = istall(X)



tf = istall(X) returns logical 1 (true) if X is a tall array. Otherwise, it returns logical 0 (false). The output, tf, is an in-memory logical scalar.


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Create an array and determine if it is a tall array.

X = tall(randn(1000,3))
X =

  1,000x3 tall double matrix

    0.5377    0.6737    0.2962
    1.8339   -0.6691    1.2008
   -2.2588   -0.4003    1.0902
    0.8622   -0.6718   -0.3587
    0.3188    0.5756   -0.1299
   -1.3077   -0.7781    0.7337
   -0.4336   -1.0636    0.1203
    0.3426    0.5530    1.1363
      :         :         :
      :         :         :
tf = istall(X)
tf = logical

Input Arguments

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Input array, specified as a scalar, vector, matrix, or multidimensional array. X can be any data type.

Extended Capabilities

Tall Arrays
Calculate with arrays that have more rows than fit in memory.

Introduced in R2016b