The format of numerical value of
failure rate for each module is:

value1, value2,
value3, ..... valueN

where, value1 is the numerical
failure rate of module A, value2 is the numerical failure rate of module
B, and so on.

For example, there are 4 modules
in the system, R_{a} = 1.5, R_{b} = 2.0, R_{c}
= 2.5, R_{d} = 0.8,

then you should input :

If it reports that the numerical value is invalid, please check that whether what you input are correct.1.5, 2.0, 2.5, 0.8

1. all data should be numericalInput the fixed time:

2. all input data should be nonnegative

You can specify a fixed time for which you want to get the reliability of system.return