sum
inline fun <T : Number, D : Dimension> MultiArray<T, D>.sumBy(selector: (T) -> Int): Int
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inline fun <T : Number, D : Dimension> MultiArray<T, D>.sumBy(selector: (T) -> Double): Double
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inline fun <T, D : Dimension> MultiArray<T, D>.sumBy(selector: (T) -> ComplexFloat): ComplexFloat
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inline fun <T, D : Dimension> MultiArray<T, D>.sumBy(selector: (T) -> ComplexDouble): ComplexDouble
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Returns the sum of all values produced by selector function applied to each element in the collection.