| Description: | Computes a pseudorandom number as a single-precision value. | ||
| Class: | Subroutine | ||
| Arguments: | I1, I2 | INTEGER(2) variables or array elements that contain the seed for computing the random number. These values are updated during the computation so that they contain the updated seed. | |
| X | A REAL(4) variable or array element where the computed random number is returned. | ||
| Results: | The result
is returned in X, which must be of type REAL(4). The result value
is a pseudorandom number in the range 0.0 to 1.0. The algorithm for
computing the random number value is based on the values for I1 and
I2.
If I1=0 and I2=0, the generator base is set as follows: X(n + 1) is stored in I1, I2. The
result is X(n + 1) scaled to a real value Y(n +
1), for 0.0 <= Y(n + 1) < 1. | ||
Examples
Consider the following:
REAL X
INTEGER(2) I, J
...
CALL RANDU (I, J, X)
If I and J are values 4 and 6, X stores the value 5.4932479E-04.