| Path : /usr/share/calc/ |
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| Current File : //usr/share/calc/gvec.cal |
/*
* gvec - vectorize any single-input function or trailing operator
*
* This version accepts arbitrary number of arguments, but of course
* they must all be same length vectors.
*
* The gvec function is for use in either a two-arg function or a two-arg
* operation "function" must be first; calc doesn't care how many more
* arguments there actually are.
*
* Under source code control: 2011/03/31 17:54:55
* File existed as early as: 2010
*
* By Carl Witthoft carl at witthoft dot com
*/
define gvec(function, vector)
{
local xlen,y,foo;
local precx = 1e-50; /* default for now */
local argc = param(0)-1;
local old_tilde; /* previous config("tilde") */
/*
* parse args
*/
local plist = mat[argc];
if (config("resource_debug") & 8) {
print "plist=", plist;
print "argc=", argc;
}
for(local i = 0; i< argc; i++) {
local ii = i + 2;
if (config("resource_debug") & 8) {
print "ii=", ii;
print "param(" : ii : "}=", param(ii);
print "size(param(" : ii : ")=", size(param(ii));
}
plist[i] = size(param(ii));
}
local slist=sort(plist);
if (config("resource_debug") & 8) {
print "plist=", plist;
}
local argm = argc-1;
if (config("resource_debug") & 8) {
print "argm=", argm;
}
if (slist[0] != slist[argm]) {
quit "lengths don't match";
}
xlen = size(vector);
y = mat[xlen];
/*
* We can't do str(vector[j]) outside loop, eval() petulantly refuses to
* look at local variables.
*
* Also we need to config("tilde",0) to turn off lead tilde
* (so str(vector[j]) looks like a number.
*/
old_tilde = config("tilde",0);
/*
* Ok, now check to see if "function" is a function. If not, it's an
* operation and it's up to user to make it valid
*/
if (isdefined(function)) {
/* yep, it's a function, either builtin or user-defined */
for (local j=0; j<xlen; j++) {
/* build the function call */
foo = strcat(function, "(");
for (local jj = 0; jj<argc; jj++) {
foo = strcat(foo , str(param(jj+2)[j]), ",");
}
foo = strcat(foo, str(precx), ")");
if (config("resource_debug") & 8) {
print "foo=", foo;
}
y[j] = eval(foo);
}
/*
* it is an operator -- multi-argument operator makes no sense
*/
} else {
if (argc > 1) {
quit "Error: operator can accept only one argument";
}
for (j=0; j<xlen; j++) {
foo = strcat(str(vector[j]), function);
y[j] = eval(foo);
}
}
/* restore tilde mode if needed */
config("tilde", old_tilde);
/* return result */
return y;
}