diff --git a/calcApp/Db/aneg_apos_test.db b/calcApp/Db/aneg_apos_test.db
new file mode 100644
index 0000000..add9d78
--- /dev/null
+++ b/calcApp/Db/aneg_apos_test.db
@@ -0,0 +1,44 @@
+record(waveform, "$(P):test_array")
+{
+    field(NELM, "10")
+    field(FTVL, "LONG")
+    field(INP, "[0, -1, 2, -3, 4, -5, 6, -7, 8, -9]")
+}
+
+record(ao, "$(P):test_number")
+{
+    field(PINI, "YES")
+    field(VAL, "-10")
+}
+
+record(acalcout, "$(P):calc_aneg_array")
+{
+    field(NELM, "10")
+    field(NUSE, "10")
+    field(INAA, "$(P):test_array CP NMA")
+    field(CALC, "ANEG(AA)")
+}
+
+record(acalcout, "$(P):calc_aneg")
+{
+    field(NELM, "10")
+    field(NUSE, "10")
+    field(INPA, "$(P):test_number CP NMA")
+    field(CALC, "ANEG(A)")
+}
+
+record(acalcout, "$(P):calc_apos_array")
+{
+    field(NELM, "10")
+    field(NUSE, "10")
+    field(INAA, "$(P):test_array CP NMA")
+    field(CALC, "APOS(AA)")
+}
+
+record(acalcout, "$(P):calc_apos")
+{
+    field(NELM, "10")
+    field(NUSE, "10")
+    field(INPA, "$(P):test_number CP NMA")
+    field(CALC, "APOS(A)")
+}
\ No newline at end of file
diff --git a/calcApp/src/aCalcPerform.c b/calcApp/src/aCalcPerform.c
index f6e7eea..43785e3 100644
--- a/calcApp/src/aCalcPerform.c
+++ b/calcApp/src/aCalcPerform.c
@@ -745,6 +745,8 @@ long aCalcPerform(double *p_dArg, int num_dArgs, double **pp_aArg,
 		case NINT:
 		case AMAX:
 		case AMIN:
+		case ANEG_VAL:
+		case APOS_VAL:
 		case IXMAX:
 		case IXMIN:
 		case IXZ:
@@ -762,6 +764,8 @@ long aCalcPerform(double *p_dArg, int num_dArgs, double **pp_aArg,
 			if (isArray(ps)) {
 				switch (op) {
 				case ABS_VAL: for (i=0; i<arraySize; i++) {if (ps->a[i] < 0) ps->a[i] *= -1;} break;
+				case ANEG_VAL: for (i=0; i<arraySize; i++) {if (ps->a[i] < 0) ps->a[i] = 0;} break;
+				case APOS_VAL: for (i=0; i<arraySize; i++) {if (ps->a[i] > 0) ps->a[i] = 0;} break;
 				case UNARY_NEG: for (i=0; i<arraySize; i++) {ps->a[i] *= -1;} break;
 				case SQU_RT:
 					status = 0;
@@ -1029,6 +1033,8 @@ long aCalcPerform(double *p_dArg, int num_dArgs, double **pp_aArg,
 			} else { /* if (isArray(ps)) */
 				switch (op) {
 				case ABS_VAL: if (ps->d < 0) {ps->d *= -1;} break;
+				case ANEG_VAL: if (ps->d < 0) {ps->d = 0;} break;
+				case APOS_VAL: if (ps->d > 0) {ps->d = 0;} break;
 				case UNARY_NEG: ps->d *= -1; break;
 				case SQU_RT:
 					if (ps->d < 0) {
diff --git a/calcApp/src/aCalcPostfix.c b/calcApp/src/aCalcPostfix.c
index 589b206..4494342 100644
--- a/calcApp/src/aCalcPostfix.c
+++ b/calcApp/src/aCalcPostfix.c
@@ -150,6 +150,8 @@ static const ELEMENT operands[] = {
 {"I",			0, 0,	1,		OPERAND,			FETCH_I},
 {"II",			0, 0,	1,		OPERAND,			FETCH_II},
 {"INT",			9, 10,	0,		UNARY_OPERATOR,		NINT},
+{"ANEG",		9, 10,	0,		UNARY_OPERATOR,		ANEG_VAL},
+{"APOS",		9, 10,	0,		UNARY_OPERATOR,		APOS_VAL},
 {"ISINF",		9, 10,	0,		UNARY_OPERATOR,		ISINF},
 {"ISNAN",		9, 10,	0,		VARARG_OPERATOR,	ISNAN},
 {"IX",			0, 0,	1,		OPERAND,			CONST_IX},
@@ -305,6 +307,8 @@ static const char *opcodes[] = {
 /* Algebraic */
 	"ABS_VAL",
 	"EXP",
+	"ANEG_VAL",
+	"APOS_VAL",
 	"LOG_10",
 	"LOG_E",
 	"MAX",
diff --git a/calcApp/src/aCalcPostfixPvt.h b/calcApp/src/aCalcPostfixPvt.h
index 0170b6b..7eb5a50 100644
--- a/calcApp/src/aCalcPostfixPvt.h
+++ b/calcApp/src/aCalcPostfixPvt.h
@@ -56,6 +56,8 @@ typedef enum {
     /* Algebraic */
 	ABS_VAL,
 	EXP,
+	ANEG_VAL,
+	APOS_VAL,
 	LOG_10,
 	LOG_E,
 	MAX,