Newbie: How can I store a previous value??

I am trying to figure out how to do the following:
int xcoor=0, ycoor=0, hstep, vstep;
while true do
update_step(hstep, vstep); // essentially have a big while loop to generate the necessary hstep/vsteps
xcoor = xcoor + hstep; // I need to add a new hstep to the xcoor
ycoor = ycoor + vstep; // I need to add a new vstep to the ycoor
updategraph(xcoor, ycoor); // and feed the updated xcoor/ycoor to an XYgraph
I think I should use a Master/Slave design? but how do I keep the previous value the first time in the Slave and then add the new values to the stored value??
Attachments:
new_Block_Diagram.bmp ‏2137 KB
new_Block_Diagram.jpg ‏174 KB

You probably want to use a shift register.
Right-click on the right edge of the loop. Select the "Add Shift Register" option.
It will add a widget on both the right and left sides of the loop.
An item wired to the right side will appear on the left side during the next pass through the loop. You can initialize the value by wiring an input to the left side widget.
[email protected]

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These all will do the same
create or replace type string_agg_type as object
2 (
3 total varchar2(4000),
4
5 static function
6 ODCIAggregateInitialize(sctx IN OUT string_agg_type )
7 return number,
8
9 member function
10 ODCIAggregateIterate(self IN OUT string_agg_type ,
11 value IN varchar2 )
12 return number,
13
14 member function
15 ODCIAggregateTerminate(self IN string_agg_type,
16 returnValue OUT varchar2,
17 flags IN number)
18 return number,
19
20 member function
21 ODCIAggregateMerge(self IN OUT string_agg_type,
22 ctx2 IN string_agg_type)
23 return number
24 );
25 /
create or replace type body string_agg_type
2 is
3
4 static function ODCIAggregateInitialize(sctx IN OUT string_agg_type)
5 return number
6 is
7 begin
8 sctx := string_agg_type( null );
9 return ODCIConst.Success;
10 end;
11
12 member function ODCIAggregateIterate(self IN OUT string_agg_type,
13 value IN varchar2 )
14 return number
15 is
16 begin
17 self.total := self.total || ',' || value;
18 return ODCIConst.Success;
19 end;
20
21 member function ODCIAggregateTerminate(self IN string_agg_type,
22 returnValue OUT varchar2,
23 flags IN number)
24 return number
25 is
26 begin
27 returnValue := ltrim(self.total,',');
28 return ODCIConst.Success;
29 end;
30
31 member function ODCIAggregateMerge(self IN OUT string_agg_type,
32 ctx2 IN string_agg_type)
33 return number
34 is
35 begin
36 self.total := self.total || ctx2.total;
37 return ODCIConst.Success;
38 end;
39
40
41 end;
42 /
Type body created.
[email protected]>
[email protected]> CREATE or replace
2 FUNCTION stragg(input varchar2 )
3 RETURN varchar2
4 PARALLEL_ENABLE AGGREGATE USING string_agg_type;
5 /
CREATE OR REPLACE FUNCTION get_employees (p_deptno in emp.deptno%TYPE)
RETURN VARCHAR2
IS
l_text VARCHAR2(32767) := NULL;
BEGIN
FOR cur_rec IN (SELECT ename FROM emp WHERE deptno = p_deptno) LOOP
l_text := l_text || ',' || cur_rec.ename;
END LOOP;
RETURN LTRIM(l_text, ',');
END;
SHOW ERRORS
The function can then be incorporated into a query as follows.
COLUMN employees FORMAT A50
SELECT deptno,
get_employees(deptno) AS employees
FROM emp
GROUP by deptno;
###########################################3
SELECT SUBSTR(STR,2) FROM
(SELECT SYS_CONNECT_BY_PATH(n,',')
STR ,LENGTH(SYS_CONNECT_BY_PATH(n,',')) LN
FROM
SELECT N,rownum rn from t )
CONNECT BY rn = PRIOR RN+1
ORDER BY LN desc )
WHERE ROWNUM=1
declare
str varchar2(32767);
begin
for i in (select sal from emp) loop
str:= str || i.sal ||',' ;
end loop;
dbms_output.put_line(str);
end;
COLUMN employees FORMAT A50
SELECT e.deptno,
get_employees(e.deptno) AS employees
FROM (SELECT DISTINCT deptno
FROM emp) e;
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10 CLARK,KING,MILLER
20 SMITH,JONES,SCOTT,ADAMS,FORD
30 ALLEN,WARD,MARTIN,BLAKE,TURNER,JAMES
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RETURN VARCHAR2
IS
l_return VARCHAR2(32767);
l_temp VARCHAR2(32767);
BEGIN
LOOP
FETCH p_cursor
INTO l_temp;
EXIT WHEN p_cursor%NOTFOUND;
l_return := l_return || ',' || l_temp;
END LOOP;
RETURN LTRIM(l_return, ',');
END;
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SELECT e1.deptno,
concatenate_list(CURSOR(SELECT e2.ename FROM emp e2 WHERE e2.deptno = e1.deptno)) employees
FROM emp e1
GROUP BY e1.deptno;
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10 CLARK,KING,MILLER
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g_string VARCHAR2(32767),
STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT t_string_agg)
RETURN NUMBER,
MEMBER FUNCTION ODCIAggregateIterate(self IN OUT t_string_agg,
value IN VARCHAR2 )
RETURN NUMBER,
MEMBER FUNCTION ODCIAggregateTerminate(self IN t_string_agg,
returnValue OUT VARCHAR2,
flags IN NUMBER)
RETURN NUMBER,
MEMBER FUNCTION ODCIAggregateMerge(self IN OUT t_string_agg,
ctx2 IN t_string_agg)
RETURN NUMBER
SHOW ERRORS
CREATE OR REPLACE TYPE BODY t_string_agg IS
STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT t_string_agg)
RETURN NUMBER IS
BEGIN
sctx := t_string_agg(NULL);
RETURN ODCIConst.Success;
END;
MEMBER FUNCTION ODCIAggregateIterate(self IN OUT t_string_agg,
value IN VARCHAR2 )
RETURN NUMBER IS
BEGIN
SELF.g_string := self.g_string || ',' || value;
RETURN ODCIConst.Success;
END;
MEMBER FUNCTION ODCIAggregateTerminate(self IN t_string_agg,
returnValue OUT VARCHAR2,
flags IN NUMBER)
RETURN NUMBER IS
BEGIN
returnValue := RTRIM(LTRIM(SELF.g_string, ','), ',');
RETURN ODCIConst.Success;
END;
MEMBER FUNCTION ODCIAggregateMerge(self IN OUT t_string_agg,
ctx2 IN t_string_agg)
RETURN NUMBER IS
BEGIN
SELF.g_string := SELF.g_string || ',' || ctx2.g_string;
RETURN ODCIConst.Success;
END;
END;
SHOW ERRORS
CREATE OR REPLACE FUNCTION string_agg (p_input VARCHAR2)
RETURN VARCHAR2
PARALLEL_ENABLE AGGREGATE USING t_string_agg;
/

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endif.
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Newbie: How can I store a previous value??

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