--- /dev/null
+package org.simantics.spreadsheet.solver.formula;
+
+import org.simantics.spreadsheet.Spreadsheets;
+import org.simantics.spreadsheet.solver.formula.parser.ast.AstArgList;
+
+public class SqrtFormulaFunction implements CellFormulaFunction<Object> {
+
+ @Override
+ public Object evaluate(CellValueVisitor visitor, AstArgList args) {
+ if (args.values.size() != 1) throw new IllegalStateException();
+
+ Object number = args.values.get(0).accept(visitor);
+ Double dVal = Spreadsheets.asDoubleWhereEmptyStringIsZero(number);
+ if(dVal==null) return FormulaError2.handleErrorCall(number);
+ if(dVal<0) return FormulaError2.NUM.getString();
+
+ return Math.sqrt(dVal);
+ }
+}