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#include <string>
#include <stdio.h>
#include <stddef.h>
#include "gr.hh"
#include "extern.hh"
#include "private.hh"
bool differentiateCmd(void);
// `differentiate {{x|y} wrt index|{y|x}} | {grid wrt x|y}'
bool
differentiateCmd()
{
unsigned int i, j;
switch (_nword) {
case 4:
if (!strcmp(_word[2], "wrt") && !strcmp(_word[1], "grid")) {
// `differentiate grid wrt ...'
if (!_xgrid_exists && !_ygrid_exists && !_grid_exists) {
err("`differentiate grid' -- no grid exists yet\n");
return false;
}
if (!strcmp(_word[3], "x")) {
// `differentiate grid wrt x'
if (_num_xmatrix_data < 3) {
err("`differentiate grid wrt x' -- too few data");
return false;
}
std::vector<bool> ok((size_t)_num_xmatrix_data, false);
std::vector<double> tmp((size_t)_num_xmatrix_data, 0.0);
for (j = 0; j < _num_ymatrix_data; j++) {
for (i = 1; i < _num_xmatrix_data - 1; i++) {
if (_legit_xy(i - 1, j) == true
&& _legit_xy(i + 1, j) == true
&& _xmatrix[i + 1] != _xmatrix[i - 1]) {
tmp[i] = (_f_xy(i + 1, j) - _f_xy(i - 1, j))
/ (_xmatrix[i + 1] - _xmatrix[i - 1]);
ok[i] = true;
} else {
ok[i] = false;
}
}
for (i = 1; i < _num_xmatrix_data - 1; i++) {
_f_xy(i, j) = tmp[i];
if (ok[i] == true) {
_f_xy(i, j) = tmp[i];
_legit_xy(i, j) = true;
} else {
_legit_xy(i, j) = false;
}
}
_f_xy(0, j) = _f_xy(1, j);
_legit_xy(0, j) = _legit_xy(1, j);
_f_xy(_num_xmatrix_data - 1, j) = _f_xy(_num_xmatrix_data - 2, j);
_legit_xy(_num_xmatrix_data - 1, j) = _legit_xy(_num_xmatrix_data - 2, j);
}
} else if (!strcmp(_word[3], "y")) {
// `differentiate grid wrt y'
if (_num_ymatrix_data < 3) {
err("`differentiate grid wrt y' -- too few data");
return false;
}
std::vector<bool> ok((size_t)_num_ymatrix_data, false);
std::vector<double> tmp((size_t)_num_ymatrix_data, 0.0);
for (i = 0; i < _num_xmatrix_data; i++) {
for (j = 1; j < _num_ymatrix_data - 1; j++) {
if (_legit_xy(i, j - 1) == true
&& _legit_xy(i, j + 1) == true
&& _ymatrix[j + 1] != _ymatrix[j - 1]) {
tmp[j] = (_f_xy(i, j + 1) - _f_xy(i, j - 1))
/ (_ymatrix[j + 1] - _ymatrix[j - 1]);
ok[j] = true;
} else {
ok[j] = false;
}
}
for (j = 1; j < _num_ymatrix_data - 1; j++) {
if (ok[j] == true) {
_f_xy(i, j) = tmp[j];
_legit_xy(i, j) = true;
} else {
_legit_xy(i, j) = false;
}
}
_f_xy(i, 0) = _f_xy(i, 1);
_legit_xy(i, 0) = _legit_xy(i, 1);
_f_xy(i, _num_ymatrix_data - 1) = _f_xy(i, _num_ymatrix_data - 2);
_legit_xy(i, _num_ymatrix_data - 1) = _legit_xy(i, _num_ymatrix_data - 2);
}
} else {
err("Can only differentiate grid wrt to `x' or `y'");
return false;
}
matrix_limits(&_f_min, &_f_max);
return true;
} else if (!strcmp(_word[2], "wrt")) {
// `differentiate ... wrt ...'
if (!strcmp(_word[1], "x")) {
// `differentiate x wrt ...'
if (_colX.size() < 1) {
err("No x column exists yet\n");
return false;
}
if (_colX.size() < 2) {
err("Sorry, x column has only 1 element\n");
return false;
}
if (!strcmp(_word[3], "index")) {
// `differentiate x wrt index'
for (i = 1; i < _colX.size(); i++) {
double x0 = _colX[i];
double xleft = _colX[i - 1];
if (!gr_missingx(x0) && !gr_missingx(xleft)) {
_colX[i - 1] = x0 - xleft;
} else {
_colX[i - 1] = gr_currentmissingvalue();
}
}
} else if (!strcmp(_word[3], "y")) {
// `differentiate x wrt y'
for (i = 1; i < _colX.size(); i++) {
double x0 = _colX[i];
double xleft = _colX[i - 1];
double y0 = _colY[i];
double yleft = _colY[i - 1];
if (!gr_missingx(x0) && !gr_missingy(y0)
&& !gr_missingx(xleft) && !gr_missingy(yleft)) {
_colX[i - 1] = (x0 - xleft) / (y0 - yleft);
} else {
_colX[i - 1] = gr_currentmissingvalue();
}
}
} else {
err("Wrong word; must be `index' or `x'");
return false;
}
// make something up for last point
_colX[_colX.size() - 1] = _colX[_colX.size() - 2];
create_x_scale();
return true;
} else if (!strcmp(_word[1], "y")) {
// `differentiate y wrt ...'
if (_colY.size() < 1) {
err("No y column exists yet\n");
return false;
}
if (_colY.size() < 2) {
err("Sorry, y column has only 1 element\n");
return false;
}
if (!strcmp(_word[3], "index")) {
// `differentiate y wrt index'
for (i = 1; i < _colY.size(); i++) {
double y0 = _colY[i];
double yleft = _colY[i - 1];
if (!gr_missingy(y0) && !gr_missingy(yleft)) {
_colY[i - 1] = y0 - yleft;
} else {
_colY[i - 1] = gr_currentmissingvalue();
}
}
} else if (!strcmp(_word[3], "x")) {
// `differentiate y wrt x'
for (i = 1; i < _colY.size(); i++) {
double x0 = _colX[i];
double xleft = _colX[i - 1];
double y0 = _colY[i];
double yleft = _colY[i - 1];
if (!gr_missingy(y0) && !gr_missingx(x0)
&& !gr_missingy(y0) && !gr_missingy(yleft)) {
_colY[i - 1] = (y0 - yleft) / (x0 - xleft);
} else {
_colY[i - 1] = gr_currentmissingvalue();
}
}
} else {
err("Wrong word; must be `index' or `y'");
return false;
}
// make something up for last point
_colY[_colY.size() - 1] = _colY[_colY.size() - 2];
create_y_scale();
return true;
} else {
err("Must be `differentiate x|y ...'");
demonstrate_command_usage();
err("Can't understand command.");
return false;
}
} else {
err("Need word `wrt'"); // not sure can get here
demonstrate_command_usage();
NUMBER_WORDS_ERROR;
return false;
}
default:
demonstrate_command_usage();
NUMBER_WORDS_ERROR;
return false;
}
}
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