path: root/doc/pddp/expr-help.pd

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#X obj 24 204 expr $s2[$f1];
#X text 21 37 Symbolic arguments like $s1 \, $s2 \, and so on are currently
used in [expr] to get the name of an array or table. You can also type
the name of an array directly into [expr] \, but this is limited since
\, for example \, a dash ("e.g. \, my-table") will get interpreted
as an operator ("e.g. \, my minus table").;
#X text 113 219 of the array will be clipped;
#X text 113 204 index values outside the range;
#X text 20 116 The following syntax outputs the y-value for the element
specified by the left inlet.;
#X text 118 154 click here first;
#X text 8 2 [expr] Using Symbolic Arguments;
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#X restore 169 397 pd expr_and_symbols;
#X obj 21 74 expr 1;
#X text 168 426 - float is the only type of output.;
#X obj 273 577 pddplink http://crca.ucsd.edu/~syadegar/expr.html;
#X text 273 563 Expr family of objects by Shahrokh Yadegari;
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#X text 19 166 This gets tricky \, because Pd strips unnecessary characters
from a floating point number. Hence \, if you try to type "8.0 / 6.0"
in the [expr] object above \, the decimal point and the following zero
will be removed once you click outside the object (try it).;
#X text 19 230 There are several work-arounds for this problem:;
#X text 19 253 1;
#X text 19 330 2;
#X obj 42 278 expr (8.0) / (6.0);
#X text 79 143 "8" and "6" above are interpreted as integers;
#X text 65 248 Putting parentheses next to the number forces Pd to
interpret it as a symbol \, so no characters are stripped.;
#X obj 42 355 expr 8.0/6.0;
#X text 65 324 Removing the space between the numbers and the operator
achieves the same thing.;
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#X text 19 410 3;
#X text 65 410 Using the "float" function makes the float type explicit.
;
#X obj 42 435 expr float(8) / 6;
#X text 7 2 [expr] Weirdness with Floats vs. Ints;
#X text 19 38 Numbers used in [expr~] follow the Max/MSP paradigm \,
where numbers without a decimal point are interpreted as integers.
This can be the source of some confusion in Pd \, which uses floating
point numbers exclusively.;
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#X text 19 486 Since float has priority over int \, the integer in
example 3 is automatically converted to a float. Likewise \, using
"6" instead of "6.0" in examples 1 and 2 would still give a floating
point result.;
#X text 19 539 These details come in handy if you want to use an integer
to specify a large number:;
#X text 166 595 What happens if you put a space;
#X obj 22 596 expr 123456789%10;
#X text 167 610 between the "%" sign and these integers?;
#X text 19 704 Unfortunately \, [expr] doesn't understand scientific
notation. But even if it did \, a float will lose precision in this
calculation:;
#X text 165 625 (Scroll down for the answer);
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#X text 11 24 expression evaluation of control data;
#X text 98 269 list;
#X msg 395 48 3 4;
#X text 183 350 1) a dollar-sign ($);
#X text 166 285 - an extra inlet is added for each additional dollar-sign
variable specified as a creation argument ($v2 \, $f3 \, etc.). Each
inlet accepts only one of the following: signal \, float \, or symbol.
There may be at most nine variables in one [expr~] object. Each variable
consists of:;
#X text 183 363 2) "v" \, "f" \, "i" or "s" (signal \, float \, integer
or symbol);
#X text 183 376 3) an inlet number (Note: inlet numbers start from
one);
#X text 168 205 - if the variable $s1 is used as an argument \, it
will be replaced by the incoming symbol. (If $f1 \, $i1 \, and $s1
are not used as arguments \, the symbol will trigger the output.);
#X text 168 126 - if the variable $f1 (float) or $i1 (integer) is specified
as an argument \, it will be replaced in the expression by the incoming
value. The expression will then be evaluated and output. (Notes: You
cannot use $f1 and $i1 in the same [expr] object. If $f1 \, $i1 \,
and $s1 are not used as arguments \, an incoming float will trigger
the output.);
#X text 168 243 - a bang will evaluate the expression with the last
received values and trigger the output.;
#X text 167 463 - the arguments themselves form the expression to evaluate.
They may be floats or symbols \, including the special variables noted
above ($i1 \, $f2 \, etc.). The operators and functions available for
use in [expr~] are listed below:;
#X text 168 269 - a list will be distributed to the inlets of [expr].
;
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#X text 80 463 n) float;
#X text 98 475 symbol atom;
#X text 98 489 comma;
#X text 98 502 semicolon;
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#X text 12 125 LIBRARY internal;
#X text 12 165 WEBSITE http://crca.ucsd.edu/~msp/;
#X text 12 145 AUTHOR Shahrokh Yadegari;
#X text 12 205 HELP_PATCH_AUTHORS Updated for Pd 0.35 test 26 and expr*
0.4. Jonathan Wilkes revised the patch to conform to the PDDP template
for Pd version 0.42.;
#X text 12 5 KEYWORDS control nonlocal trigonometry;
#X text 12 65 INLET_0 float bang symbol list;
#X text 12 85 INLET_N float symbol;
#X text 12 105 OUTLET_N float;
#X text 12 45 DESCRIPTION expression evaluation of control data;
#X text 12 185 RELEASE_DATE 1989;
#X text 12 25 LICENSE GPL v2;
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#X text 7 2 [expr] Related Objects;
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