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-1 0; +#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; +#X connect 0 0 8 0; +#X connect 3 0 4 0; +#X connect 5 0 6 0; +#X connect 6 0 8 1; +#X connect 8 0 1 0; +#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; +#N canvas 91 55 428 501 expr_weirdness 0; +#X obj 42 98 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 +-1; +#X floatatom 42 143 5 0 0 0 - - -; +#X obj 1 1 cnv 15 425 20 empty \$0-pddp.cnv.subheading empty 3 12 0 +14 -204280 -1 0; +#X obj 42 119 expr 8 / 6; +#X obj 42 254 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 +-1; +#X floatatom 42 302 5 0 0 0 - - -; +#X obj 42 331 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 +-1; +#X floatatom 42 379 5 0 0 0 - - -; +#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.; +#X obj 42 411 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 +-1; +#X floatatom 42 459 5 0 0 0 - - -; +#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.; +#X obj 22 576 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 +-1; +#X floatatom 22 618 5 0 0 0 - - -; +#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); +#X obj 22 747 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 +-1; +#X floatatom 22 789 5 0 0 0 - - -; +#X obj 22 767 expr int(123456789.0)%10; +#X connect 0 0 3 0; +#X connect 3 0 1 0; +#X connect 4 0 12 0; +#X connect 6 0 15 0; +#X connect 12 0 5 0; +#X connect 15 0 7 0; +#X connect 17 0 21 0; +#X connect 21 0 18 0; +#X connect 24 0 29 0; +#X connect 29 0 25 0; +#X connect 33 0 35 0; +#X connect 35 0 34 0; +#X restore 275 546 pd expr_weirdness; +#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]. +; +#X obj 170 516 pddp/pddplink all_about_expr_functions.pd -text all_about_expr_operators_and_functions +; +#X text 80 463 n) float; +#X text 98 475 symbol atom; +#X text 98 489 comma; +#X text 98 502 semicolon; +#X obj 101 546 pddp/pddplink all_about_expr_if.pd -text expr_if; +#X obj 101 561 pddp/pddplink all_about_expr_and_value.pd -text expr_and_value +; +#X obj 101 578 pddp/pddplink all_about_expr_multiline.pd -text expr_multiline +; +#X obj 0 595 cnv 15 552 21 empty \$0-pddp.cnv.footer empty 20 12 0 +14 -228856 -66577 0; +#N canvas 52 244 494 344 META 0; +#X text 12 105 PLATFORM windows macosx gnulinux; +#X text 12 185 LIBRARY internal; +#X text 12 225 WEBSITE http://crca.ucsd.edu/~msp/; +#X text 12 205 AUTHOR Shahrokh Yadegari; +#X text 12 285 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 GENRE help; +#X text 12 45 KEYWORDS control nonlocal trigonometry; +#X text 12 25 NAME expr; +#X text 12 125 INLET_0 float bang symbol list; +#X text 12 145 INLET_N float symbol; +#X text 12 165 OUTLET_N float; +#X text 12 85 DESCRIPTION expression evaluation of control data; +#X text 12 245 RELEASE_DATE 1989; +#X text 12 265 RELEASE_VERSION; +#X text 12 65 LICENSE GPL v2; +#X restore 500 598 pd META; +#N canvas 102 481 428 109 Related_objects 0; +#X obj 1 1 cnv 15 425 20 empty \$0-pddp.cnv.subheading empty 3 12 0 +14 -204280 -1 0; +#X obj 22 43 expr~; +#X obj 62 43 fexpr~; +#X text 7 2 [expr] Related Objects; +#X restore 101 598 pd Related_objects; +#X obj 4 598 pddp/pddplink pddp/help.pd -text help; +#X connect 13 0 27 0; +#X connect 15 0 29 0; +#X connect 17 0 19 0; +#X connect 19 0 18 0; +#X connect 20 0 19 1; +#X connect 21 0 23 0; +#X connect 23 0 22 0; +#X connect 27 0 16 0; +#X connect 29 0 14 0; +#X connect 36 0 19 0; |