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648cdbaa29
Derivation now propagates to powers as expected, whether the base, the exponent, or both are functions of the variable. This also makes division derive as intended. Change-Id: I51cbd5f7ec9f6aaa1df068625bbda1437941fa08
40 lines
1.7 KiB
C++
40 lines
1.7 KiB
C++
#include <poincare/derivative.h>
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#include <poincare/init.h>
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#include <poincare/src/parsing/parser.h>
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#include <poincare_nodes.h>
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#include <apps/shared/global_context.h>
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#include "helper.h"
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using namespace Poincare;
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void assert_parses_and_reduces_as(const char * expression, const char * derivative) {
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Shared::GlobalContext globalContext;
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Expression e = parse_expression(expression, &globalContext, false);
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Expression eReduced = e.reduce(ExpressionNode::ReductionContext(&globalContext, Cartesian, Radian, User));
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Expression d = parse_expression(derivative, &globalContext, false).reduce(ExpressionNode::ReductionContext(&globalContext, Cartesian, Radian, User));
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quiz_assert_print_if_failure(eReduced.isIdenticalTo(d), expression);
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}
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QUIZ_CASE(poincare_differential_addition) {
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assert_parses_and_reduces_as("diff(1,x,1)", "0");
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assert_parses_and_reduces_as("diff(x,x,1)", "1");
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assert_parses_and_reduces_as("diff(1+2,x,1)", "0");
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assert_parses_and_reduces_as("diff(a,x,1)", "0");
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assert_parses_and_reduces_as("diff(1+x,x,1)", "1");
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assert_parses_and_reduces_as("diff(undef,x,1)", "undef");
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assert_parses_and_reduces_as("diff(x+x,x,4)", "2");
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assert_parses_and_reduces_as("diff(2*x,x,1)", "2");
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assert_parses_and_reduces_as("diff(-x,x,1)", "-1");
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assert_parses_and_reduces_as("diff(3-x,x,1)", "-1");
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assert_parses_and_reduces_as("diff(a*x,x,2)", "a");
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assert_parses_and_reduces_as("diff(a*x+b,x,x)", "a");
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assert_parses_and_reduces_as("diff(x*x,x,3)", "6");
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assert_parses_and_reduces_as("diff(x^2,x,2)", "4");
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assert_parses_and_reduces_as("diff(2^x,x,0)", "ln(2)");
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assert_parses_and_reduces_as("diff(x^2,x,x)", "2*x");
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assert_parses_and_reduces_as("diff(a*x^2+b*x+c,x,x)", "2*a*x+b");
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assert_parses_and_reduces_as("diff(1/x,x,1)", "-1");
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} |