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Reference manual: fix the description of deterministic shocks

time-shift
Sébastien Villemot 2010-11-24 13:40:40 +01:00
parent 43f69d27e8
commit a03516b988
1 changed files with 10 additions and 6 deletions
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16
doc/manual.xml
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@ -1544,7 +1544,14 @@ end;
For deterministic simulations, the <command>shocks</command> block specifies temporary changes in the value of an exogenous variables. For permanent shocks, use an <xref linkend='endval'/> block.
</para>
<para>When specifying shocks on several periods, the <command>values</command> <replaceable>EXPRESSION</replaceable> must return either a scalar value common to all periods with a shock or a column vector with as many elements as there are periods in the <command>periods</command> statement just before it.
<para>
It is possible to specify shocks which last several periods and which can
vary over time. The <command>periods</command> keyword accepts a list of
several dates or date ranges, which must be matched by as many shock values
in the <command>values</command> keyword. Note that a range in the
<command>periods</command> keyword must be matched by only one value in the
<command>values</command> keyword: this syntax means that the exogenous
will have a constant value over the range.
</para>
<refsect3><title>Example</title>
@ -1558,11 +1565,8 @@ var u;
periods 4:5;
values 0;
var v;
periods 4 5 6;
values 0;
var u;
periods 4 5 6;
values 1 1.1 0.9;
periods 4:5 6 7:9;
values 1 1.1 0.9;
end;
</programlisting>
</informalexample>