Plotter

jscl/src/main/java/jscl/math/Generic.java

@@ -1,17 +1,40 @@
 package jscl.math;
 
 import jscl.math.function.Constant;
+import jscl.math.function.IConstant;
 import jscl.mathml.MathML;
 import jscl.text.ParserUtils;
-
-import java.math.BigInteger;
-import java.util.Set;
+import org.solovyev.common.math.MathRegistry;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
+import java.math.BigInteger;
+import java.util.HashSet;
+import java.util.Set;
 
 public abstract class Generic implements Arithmetic<Generic>, Comparable {
 
+    @Nonnull
+    public Set<Constant> getUndefinedConstants(@Nonnull MathRegistry<IConstant> constantsRegistry) {
+        final Set<Constant> result = new HashSet<>();
+
+        for (Constant expressionConstant : getConstants()) {
+            final IConstant registryConstant = constantsRegistry.get(expressionConstant.getName());
+            if (registryConstant == null) {
+                continue;
+            }
+            if (registryConstant.isSystem()) {
+                continue;
+            }
+            if(registryConstant.isDefined()) {
+                continue;
+            }
+            result.add(expressionConstant);
+        }
+
+        return result;
+    }
+
     public BigInteger toBigInteger() {
         return null;
     }

jscl/src/main/java/jscl/math/function/CustomFunction.java

@@ -43,7 +43,7 @@ public class CustomFunction extends Function implements IFunction {
     private CustomFunction(@Nonnull String name,
                            @Nonnull List<String> parameterNames,
                            @Nonnull String content,
-                           @Nullable String description) {
+                           @Nullable String description) throws CustomFunctionCalculationException {
         super(name, new Generic[parameterNames.size()]);
         this.parameterNames = parameterNames;
         try {
@@ -321,7 +321,7 @@ public class CustomFunction extends Function implements IFunction {
         }
 
         @Nonnull
-        public CustomFunction create() {
+        public CustomFunction create() throws CustomFunctionCalculationException {
             final CustomFunction customFunction = new CustomFunction(name, parameterNames, prepareContent(content), description);
             customFunction.setSystem(system);
             if (id != null) {