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Commit faa0e65f authored by Jukka-Pekka Iivonen's avatar Jukka-Pekka Iivonen Committed by jpekka
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Implemented PERCENTILE() function. 

1999-09-19  Jukka-Pekka Iivonen  <iivonen@iki.fi>

	* src/functions/fn-stat.c: Implemented PERCENTILE() function.
parent 661ccc2d
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ChangeLog-2000-02-23
View file @ faa0e65f
1999-09-19 Jukka-Pekka Iivonen <iivonen@iki.fi>
* src/functions/fn-stat.c: Implemented PERCENTILE() function.
1999-09-19 Jody Goldberg <jgoldberg@home.com>
* src/value.c (value_release) : Releasing value_terminate should not
......
NEWS
View file @ faa0e65f
......@@ -7,7 +7,8 @@ Jody:
Jukka:
* Major clean up to the documentation of functions.
* Added tons of examples to functions.
* Added ``Delete'' entry to ``Edit'' menu.
* Added ``Delete...'' entry to ``Edit'' menu.
* Implemented PERCENTILE function.
Miguel:
* New toolbar code.
......
OChangeLog-2000-02-23
View file @ faa0e65f
1999-09-19 Jukka-Pekka Iivonen <iivonen@iki.fi>
* src/functions/fn-stat.c: Implemented PERCENTILE() function.
1999-09-19 Jody Goldberg <jgoldberg@home.com>
* src/value.c (value_release) : Releasing value_terminate should not
......
TODO
View file @ faa0e65f
......@@ -42,7 +42,7 @@ Gnumeric Spread Sheet task list
* Implement Even More Functions
* AREAS, INDEX, MATCH, GETPIVOTDATA, GROWTH, LOGEST, and PERCENTILE
* AREAS, INDEX, MATCH, GETPIVOTDATA, GROWTH, and LOGEST
* Finish LINEST and TREND
* AMORDEGRC, AMORLINC, COUPDAYBS, COUPDAYS, COUPDAYSNC, COUPNCD,
COUPNUM, COUPPCD, CUMIPMT, CUMPRINC, IRR, MDURATION, MIRR,
......
plugins/fn-stat/functions.c
View file @ faa0e65f
......@@ -75,7 +75,6 @@ callback_function_stat (const EvalPosition *ep, Value *value, void *closure)
return NULL;
}
typedef struct {
GSList *entries;
int n;
......@@ -3099,6 +3098,8 @@ static char *help_percentrank = {
typedef struct {
float_t x;
float_t smaller_x;
float_t greater_x;
int smaller;
int greater;
int equal;
......@@ -3116,11 +3117,15 @@ callback_function_percentrank (const EvalPosition *ep, Value *value,
y = value_get_as_float (value);
if (y < p->x)
if (y < p->x) {
p->smaller++;
else if (y > p->x)
if (p->smaller_x == p->x || p->smaller_x < y)
p->smaller_x = y;
} else if (y > p->x) {
p->greater++;
else
if (p->greater_x == p->x || p->greater_x > y)
p->greater_x = y;
} else
p->equal++;
return NULL;
......@@ -3134,13 +3139,15 @@ gnumeric_percentrank (FunctionEvalInfo *ei, Value **argv)
float_t x, k, pr;
int col, row, n;
int significance;
Value *ret;
Value *ret;
x = value_get_as_float (argv[1]);
p.smaller = 0;
p.greater = 0;
p.equal = 0;
p.smaller_x = x;
p.greater_x = x;
p.x = x;
if (argv[2] == NULL)
......@@ -3165,10 +3172,10 @@ gnumeric_percentrank (FunctionEvalInfo *ei, Value **argv)
if (p.equal == 1)
pr = (float_t) p.smaller / (p.smaller+p.greater);
else if (p.equal == 0)
pr = (float_t) p.smaller / (p.smaller+p.greater) +
0.5 / (p.smaller+p.greater);
else
else if (p.equal == 0) {
float_t a = (x-p.smaller_x) / (p.greater_x-p.smaller_x);
pr = (float_t) (p.smaller + a-1) / (p.greater+p.smaller-1.0);
} else
pr = (p.smaller + 0.5 * p.equal) /
(p.smaller + p.equal + p.greater);
......@@ -3185,6 +3192,62 @@ gnumeric_percentrank (FunctionEvalInfo *ei, Value **argv)
/***************************************************************************/
static char *help_percentile = {
N_("@FUNCTION=PERCENTILE\n"
"@SYNTAX=PERCENTILE(array,k)\n"
"@DESCRIPTION="
"PERCENTILE function returns the k-th percentile of the given data "
"points. "
"\n"
"If @array is empty, PERCENTILE returns #NUM! error. "
"If @k < 0 or @k > 1, PERCENTILE returns #NUM! error. "
"This function is Excel compatible. "
"\n"
"@EXAMPLES=\n"
"Let us assume that the cells A1, A2, ..., A5 contain numbers "
"11.4, 17.3, 21.3, 25.9, and 40.1. Then\n"
"PERCENTILE(A1:A5,0.42) equals 20.02.\n"
"\n"
"@SEEALSO=QUARTILE")
};
static Value *
gnumeric_percentile (FunctionEvalInfo *ei, Value **argv)
{
float_t k, *data, fract, des, a, b;
int n;
Value *result = NULL;
k = value_get_as_float (argv[1]);
data = collect_floats_value (argv[0], &ei->pos,
COLLECT_IGNORE_STRINGS |
COLLECT_IGNORE_BOOLS,
&n, &result);
if (result)
goto out;
if (n == 0 || k < 0 || k > 1) {
result = value_new_error (&ei->pos, gnumeric_err_NUM);
goto out;
}
qsort ((float_t *) data, n, sizeof (data[0]), (void *) &float_compare);
fract = k * (n-1);
des = fract - (int) fract;
a = data[(int) fract];
b = data[(int) fract + 1];
result = value_new_float (b * des + a * (1.0-des));
out:
g_free (data);
return result;
}
/***************************************************************************/
static char *help_quartile = {
N_("@FUNCTION=QUARTILE\n"
"@SYNTAX=QUARTILE(array,quart)\n"
......@@ -4138,6 +4201,8 @@ stat_functions_init (void)
&help_normsdist, gnumeric_normsdist);
function_add_args (cat, "normsinv", "f", "",
&help_normsinv, gnumeric_normsinv);
function_add_args (cat, "percentile", "Af", "array,k",
&help_percentile, gnumeric_percentile);
function_add_args (cat, "percentrank", "Af|f", "array,x,significance",
&help_percentrank, gnumeric_percentrank);
function_add_args (cat, "pearson", "AA", "array1,array2",
......
src/functions/fn-stat.c
View file @ faa0e65f
......@@ -75,7 +75,6 @@ callback_function_stat (const EvalPosition *ep, Value *value, void *closure)
return NULL;
}
typedef struct {
GSList *entries;
int n;
......@@ -3099,6 +3098,8 @@ static char *help_percentrank = {
typedef struct {
float_t x;
float_t smaller_x;
float_t greater_x;
int smaller;
int greater;
int equal;
......@@ -3116,11 +3117,15 @@ callback_function_percentrank (const EvalPosition *ep, Value *value,
y = value_get_as_float (value);
if (y < p->x)
if (y < p->x) {
p->smaller++;
else if (y > p->x)
if (p->smaller_x == p->x || p->smaller_x < y)
p->smaller_x = y;
} else if (y > p->x) {
p->greater++;
else
if (p->greater_x == p->x || p->greater_x > y)
p->greater_x = y;
} else
p->equal++;
return NULL;
......@@ -3134,13 +3139,15 @@ gnumeric_percentrank (FunctionEvalInfo *ei, Value **argv)
float_t x, k, pr;
int col, row, n;
int significance;
Value *ret;
Value *ret;
x = value_get_as_float (argv[1]);
p.smaller = 0;
p.greater = 0;
p.equal = 0;
p.smaller_x = x;
p.greater_x = x;
p.x = x;
if (argv[2] == NULL)
......@@ -3165,10 +3172,10 @@ gnumeric_percentrank (FunctionEvalInfo *ei, Value **argv)
if (p.equal == 1)
pr = (float_t) p.smaller / (p.smaller+p.greater);
else if (p.equal == 0)
pr = (float_t) p.smaller / (p.smaller+p.greater) +
0.5 / (p.smaller+p.greater);
else
else if (p.equal == 0) {
float_t a = (x-p.smaller_x) / (p.greater_x-p.smaller_x);
pr = (float_t) (p.smaller + a-1) / (p.greater+p.smaller-1.0);
} else
pr = (p.smaller + 0.5 * p.equal) /
(p.smaller + p.equal + p.greater);
......@@ -3185,6 +3192,62 @@ gnumeric_percentrank (FunctionEvalInfo *ei, Value **argv)
/***************************************************************************/
static char *help_percentile = {
N_("@FUNCTION=PERCENTILE\n"
"@SYNTAX=PERCENTILE(array,k)\n"
"@DESCRIPTION="
"PERCENTILE function returns the k-th percentile of the given data "
"points. "
"\n"
"If @array is empty, PERCENTILE returns #NUM! error. "
"If @k < 0 or @k > 1, PERCENTILE returns #NUM! error. "
"This function is Excel compatible. "
"\n"
"@EXAMPLES=\n"
"Let us assume that the cells A1, A2, ..., A5 contain numbers "
"11.4, 17.3, 21.3, 25.9, and 40.1. Then\n"
"PERCENTILE(A1:A5,0.42) equals 20.02.\n"
"\n"
"@SEEALSO=QUARTILE")
};
static Value *
gnumeric_percentile (FunctionEvalInfo *ei, Value **argv)
{
float_t k, *data, fract, des, a, b;
int n;
Value *result = NULL;
k = value_get_as_float (argv[1]);
data = collect_floats_value (argv[0], &ei->pos,
COLLECT_IGNORE_STRINGS |
COLLECT_IGNORE_BOOLS,
&n, &result);
if (result)
goto out;
if (n == 0 || k < 0 || k > 1) {
result = value_new_error (&ei->pos, gnumeric_err_NUM);
goto out;
}
qsort ((float_t *) data, n, sizeof (data[0]), (void *) &float_compare);
fract = k * (n-1);
des = fract - (int) fract;
a = data[(int) fract];
b = data[(int) fract + 1];
result = value_new_float (b * des + a * (1.0-des));
out:
g_free (data);
return result;
}
/***************************************************************************/
static char *help_quartile = {
N_("@FUNCTION=QUARTILE\n"
"@SYNTAX=QUARTILE(array,quart)\n"
......@@ -4138,6 +4201,8 @@ stat_functions_init (void)
&help_normsdist, gnumeric_normsdist);
function_add_args (cat, "normsinv", "f", "",
&help_normsinv, gnumeric_normsinv);
function_add_args (cat, "percentile", "Af", "array,k",
&help_percentile, gnumeric_percentile);
function_add_args (cat, "percentrank", "Af|f", "array,x,significance",
&help_percentrank, gnumeric_percentrank);
function_add_args (cat, "pearson", "AA", "array1,array2",
......
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