public void Subtract(TermSum value)
{
foreach (var kvp in value)
{
Subtract(kvp.Key, kvp.Value);
}
}
public void Add(TermSum value)
{
foreach (var kvp in value)
{
Add(kvp.Key, kvp.Value);
}
}
public static TermSum GetProduct(TermSum arg1, double value)
{
var result = new TermSum();
foreach (var x in arg1._ratios)
{
var ratio = x.Value * value;
result.Add(x.Key, ratio);
}
return(result);
}
public static string AsString(this TermSum value)
{
var str = string.Concat(value
.Where(x => x.Value != 0)
.Select((kvp, i) =>
string.Concat(
i > 0 && kvp.Value > 0 ? "+" : "",
kvp.Value switch
{
1 => kvp.Key.IsEmpty ? "1" : "",
-1 => kvp.Key.IsEmpty ? "-1" : "-",
_ => kvp.Value.ToString(CultureInfo.InvariantCulture)
},
public static TermSum GetProduct(TermSum arg1, TermSum arg2)
{
var result = new TermSum();
foreach (var x in arg1._ratios)
{
foreach (var y in arg2._ratios)
{
var ratio = x.Value * y.Value;
var term = Term.GetProduct(x.Key, y.Key);
result.Add(term, ratio);
}
}
return(result);
}
private TermSum Parse(ReadOnlySpan <char> text)
{
var next = 0;
TermSum arg = null;
while (next < text.Length)
{
if (text[next] == ' ')
{
next++;
continue;
}
if (TryGetGroup(text, ref next, out var arg2))
{
SetOrMultiply(ref arg, arg2);
continue;
}
// (?<sign>+-)?(?<coef>[\.0-9]*)
GetSign(text, next, out var sign, out var slen);
next += slen;
if (slen == 0 && arg != null)
{
throw new ArgumentException("Unexpected input value");
}
GetDouble(text, next, out var coef, out var coefLength);
coef *= sign;
next += coefLength;
//(?<group>\(.*\))
if (TryGetGroup(text, ref next, out arg2))
{
SetOrAdd(ref arg, TermSum.GetProduct(arg2, coef));
}
//(?<x1>[a-zA-Z](^\d)?)(?<x2>[a-zA-Z](^\d)?)...
else if (TryGetTerm(text, next, out var term, out var tlen))
{
if (arg == null)
{
arg = new TermSum();
}
arg.Add(term, coef);
next += tlen;
}