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Explore Stack Internal#MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 or 1 with the same probability i % input (number K to be added) * % multiply: gives either 0 or K for each element + % add element-wise #MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 or 1 with the same probability i % input (number K to be added) * % multiply: gives either 0 or K for each element + % add element-wise tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 or 1 with the same probability i % input (number K to be added) * % multiply: gives either 0 or K for each element + % add element-wise #MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 andor 1 with the same probability i % input (number K to be added) * % multiply: gives either K0 or 0K for each element + % add element-wise #MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 and 1 with the same probability i % input (number K to be added) * % multiply: gives either K or 0 for each element + % add element-wise #MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 or 1 with the same probability i % input (number K to be added) * % multiply: gives either 0 or K for each element + % add element-wise #MATL#MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 and 1 with the same probability i % input (number K to be added) * % multiply: gives either K or 0 for each element + % add element-wise #MATL, 11 bytes
tZy1$rEki*+ Uses floating point random numbers.
t % implicit input (array). Duplicate Zy % size (array specifying number of rows and columns) 1$r % random vector between 0 and 1 with that size Ek % duplicate, round down: gives 0 and 1 with the same probability i % input (number K to be added) * % multiply: gives either K or 0 for each element + % add element-wise