KDAriane

h1. Eval121

h2. Synopsis

This operator has one parameter, two inputs and one output. The corresponding shell script executes the parameter as a command on both inputs, and copies the result to the output.

h2. Parameters

1 parameter, treated as the command to be executed.

h2. Inputs

2 input files.

h2. Outputs

1 output: the result of the command

h2. Shell code

<pre>

cmd=$1; shift

input1=$1; shift

input2=$1; shift

output=$1; shift

$cmd $input1 $input2 > $output

</pre>

h2. Example

This operator is mainly used for combining two files :

* in all for-loops, where the accumulator is handled by a @cat@ or a @paste@ in the loop

* in the discretization process [[discretization.aws]] for computing the dictionary starting from the data and the columns format