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:
Otherwise, it is set as follows:
The generator base `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.

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