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SciMax Toolbox >> %%

%%

System variable

%%

Description

In compound statements, namely block, lambda, or (s_1, ..., s_n), %% is the value of the previous statement. For example,

block (integrate (x^5, x), ev (%%, x=2) - ev (%%, x=1));
block ([prev], prev: integrate (x^5, x),
               ev (prev, x=2) - ev (prev, x=1));

yield the same result, namely 21/2.

A compound statement may comprise other compound statements. Whether a statement be simple or compound, %% is the value of the previous statement. For example,

block (block (a^n, %%*42), %%/6)

yields 7*a^n.

Within a compound statement, the value of %% may be inspected at a break prompt, which is opened by executing the break function. For example, at the break prompt opened by

block (a: 42, break ())$

entering %%; yields 42.

At the first statement in a compound statement, or outside of a compound statement, %% is undefined.

%% is recognized by batch and load, and it has the same meaning as at the interactive prompt.

See also .

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