Subtract Basic Block


Subtract - subtract from a variable

   Subtract
    var1
    1.0
.........
This block subtracts a variable fom a value.
The value can be a constant or another variable.



variable xml

(click outside to set) 
<block kind="basic" name="Subtract">
  <param kind="variable">var1</param>
  <param kind="value">1.0</param>
</block>

add tests for variable(s) exists.

test that variable valid name.

kind="value" when it's a variable?

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