private void Derivate_Click(object sender, RoutedEventArgs e)
{
if (Function.Text.IndexOf('\\') != -1)
{
IsValidCheckBox.IsChecked = false;
return;
}
if (!IsValid(Function.Text))
{
IsValidCheckBox.IsChecked = false;
return;
}
IsValidCheckBox.IsChecked = true;
MathExpression function = Parse(Function.Text);
MathExpression derivative = function.Root.Derivative(Variable.Text);
Derivative.Text = derivative.ToString();
}
/// <summary>
/// Gets the resolved text where the expression have been evaluated, the resolved text is cached so do not worry about calling this multiple times
/// </summary>
/// <returns>The resolved text where the expression have been evaluated</returns>
public string GetResolvedText()
{
if (resolvedTextNeedCache)
{
int start = SimpleText.IndexOf(OpeningExpressionDelimiter);
int end = SimpleText.IndexOf(ClosingExpressionDelimiter);
if (start == -1)
{
return(SimpleText);
}
double result = new MathExpression(SimpleText.Substring(start + 1, end - start - 1)).Evaluate();
cachedResolvedText = SimpleText.Replace(SimpleText.Substring(start, end - start + 1), result.ToString(formatStr, CultureInfo.InvariantCulture));
}
return(cachedResolvedText);
}
public void UnaryMinusTest1()
{
expr = new MathExpression("-2+3");
Console.WriteLine(expr.ToString());
Assert.AreEqual(1, expr.Calculate());
}
