Want to learn more about shift registers and formula nodes
I am new to Labview and have looked at the example files and help files regarding shift registers and formula nodes. I was hoping that someone has a simple and detailed VI expaining how each of them(shift registers and formula nodes) works.
Formula nodes are not one of the first things you will need to be looking at. look at the help files (press ctrl-H) for some syntax examples. Shift registers are easy: they carry the value from the end of the loop back into the start of the loop. The great power of shift registers is to use them without initializing. In that case they will retain their last value as long as the vi is in memory. This is a little more advanced topic, though.
I included a simple example that illustrates what a shift register does. Requires Labview 7.1
Good luck,
aartjan
Attachments:
shift (LV7.1).vi 19 KB
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CREATE OR REPLACE PACKAGE "CSV_UTIL"
as
By Oleg Lihvoinen:
Parse and de_quote procedures are taken from AskTom and modified
type vcArray is table of varchar2(32767) index by binary_integer;
g_words vcArray;
g_empty vcArray;
g_last_string varchar2(32767);
procedure parse( p_str in varchar2,
p_enc_by in varchar2,
p_sep in varchar2 );
procedure upload(p_file_name VARCHAR2, p_collection_name VARCHAR2, p_enc_by IN VARCHAR2, p_sep_by IN VARCHAR2, p_rows NUMBER);
function de_quote( p_str in varchar2,
p_enc_by in varchar2 )
return varchar2;
end;
CREATE OR REPLACE PACKAGE BODY "CSV_UTIL"
AS
FUNCTION de_quote (p_str IN VARCHAR2, p_enc_by IN VARCHAR2)
RETURN VARCHAR2
IS
v_str VARCHAR2(32767) := p_str;
BEGIN
IF (p_enc_by IS NULL)
THEN
RETURN p_str;
ELSE
IF SUBSTR(p_str,-1) = p_enc_by THEN
v_str := SUBSTR(p_str,1,LENGTH(p_str)-1);
END IF;
IF SUBSTR(p_str,1,1) = p_enc_by THEN
v_str := SUBSTR(v_str,2);
END IF;
RETURN REPLACE (v_str,
p_enc_by || p_enc_by,
p_enc_by
END IF;
END de_quote;
PROCEDURE parse (p_str IN VARCHAR2, p_enc_by IN VARCHAR2, p_sep IN VARCHAR2)
IS
l_n NUMBER DEFAULT 1;
l_in_quote BOOLEAN DEFAULT FALSE;
l_ch NCHAR (1);
l_len NUMBER DEFAULT NVL (LENGTH (p_str), 0);
BEGIN
IF (l_len = 0)
THEN
RETURN;
END IF;
g_words := g_empty;
g_words (1) := NULL;
FOR i IN 1 .. l_len
LOOP
l_ch := SUBSTR (p_str, i, 1);
IF (l_ch = p_enc_by)
THEN
l_in_quote := NOT l_in_quote;
END IF;
IF (l_ch = p_sep AND NOT l_in_quote)
THEN
l_n := l_n + 1;
g_words (l_n) := NULL;
ELSE
g_words (l_n) := g_words (l_n) || l_ch;
END IF;
END LOOP;
g_words (l_n) := de_quote (g_words (l_n), CHR(10));
g_words (l_n) := de_quote (g_words (l_n), CHR(13));
FOR i IN 1 .. l_n
LOOP
g_words (i) := de_quote (g_words (i), p_enc_by);
END LOOP;
END parse;
Author: Oleg Lihvoinen
Company: DbSWH
PROCEDURE upload (p_file_name VARCHAR2, p_collection_name VARCHAR2, p_enc_by IN VARCHAR2, p_sep_by IN VARCHAR2, p_rows NUMBER)
IS
v_blob_data BLOB;
v_clob_data CLOB;
v_clob_len NUMBER;
v_position NUMBER;
v_char NCHAR (1);
c_chunk_len NUMBER := 1;
v_line VARCHAR2 (32767) := NULL;
v_data_array vcarray;
v_rows NUMBER := 0;
n_seq NUMBER := 1;
dest_offset NUMBER := 1;
src_offset NUMBER := 1;
amount INTEGER := DBMS_LOB.lobmaxsize;
blob_csid NUMBER := DBMS_LOB.default_csid;
lang_ctx INTEGER := DBMS_LOB.default_lang_ctx;
warning INTEGER;
l_sep VARCHAR2(100) := CASE WHEN p_sep_by = '\t' THEN chr(9) ELSE p_sep_by END;
BEGIN
htmldb_collection.create_or_truncate_collection
(p_collection_name => p_collection_name);
-- Read blob from wwv_flow_files
SELECT blob_content
INTO v_blob_data
FROM wwv_flow_files
WHERE NAME = p_file_name;
v_position := 1;
DBMS_LOB.createtemporary (lob_loc => v_clob_data,
CACHE => TRUE,
dur => DBMS_LOB.SESSION
DBMS_LOB.converttoclob (v_clob_data,
v_blob_data,
amount,
dest_offset,
src_offset,
blob_csid,
lang_ctx,
warning
v_clob_len := DBMS_LOB.getlength (v_clob_data);
IF v_clob_len = 0 THEN
RETURN;
END IF;
WHILE (v_position <= v_clob_len)
LOOP
v_char := DBMS_LOB.SUBSTR (v_clob_data, c_chunk_len, v_position);
v_line := v_line || v_char;
v_position := v_position + c_chunk_len;
-- When the whole line is retrieved and not end of file or end of file
IF v_char = CHR (10) AND v_position < v_clob_len OR v_position = v_clob_len
THEN
parse (p_str => v_line, p_enc_by => p_enc_by, p_sep => l_sep);
v_data_array := g_words;
FOR i IN 1..g_words.count LOOP
IF i <= 50 THEN
v_data_array(i) := g_words(i);
ELSE
exit;
END IF;
END LOOP;
FOR i IN g_words.count + 1..50 LOOP
v_data_array(i) := null;
END LOOP;
v_rows := v_rows + 1;
-- exit if uploaded specified number of rows
IF p_rows IS NOT NULL AND v_rows > p_rows THEN
EXIT;
END IF;
-- Store data to collection
n_seq :=
htmldb_collection.add_member
(p_collection_name => p_collection_name,
p_c001 => v_data_array
(1),
p_c002 => v_data_array
(2),
p_c003 => v_data_array
(3),
p_c004 => v_data_array
(4),
p_c005 => v_data_array
(5),
p_c006 => v_data_array
(6),
p_c007 => v_data_array
(7),
p_c008 => v_data_array
(8),
p_c009 => v_data_array
(9),
p_c010 => v_data_array
(10),
p_c011 => v_data_array
(11),
p_c012 => v_data_array
(12),
p_c013 => v_data_array
(13),
p_c014 => v_data_array
(14),
p_c015 => v_data_array
(15),
p_c016 => v_data_array
(16),
p_c017 => v_data_array
(17),
p_c018 => v_data_array
(18),
p_c019 => v_data_array
(19),
p_c020 => v_data_array
(20),
p_c021 => v_data_array
(21),
p_c022 => v_data_array
(22),
p_c023 => v_data_array
(23),
p_c024 => v_data_array
(24),
p_c025 => v_data_array
(25),
p_c026 => v_data_array
(26),
p_c027 => v_data_array
(27),
p_c028 => v_data_array
(28),
p_c029 => v_data_array
(29),
p_c030 => v_data_array
(30),
p_c031 => v_data_array
(31),
p_c032 => v_data_array
(32),
p_c033 => v_data_array
(33),
p_c034 => v_data_array
(34),
p_c035 => v_data_array
(35),
p_c036 => v_data_array
(36),
p_c037 => v_data_array
(37),
p_c038 => v_data_array
(38),
p_c039 => v_data_array
(39),
p_c040 => v_data_array
(40),
p_c041 => v_data_array
(41),
p_c042 => v_data_array
(42),
p_c043 => v_data_array
(43),
p_c044 => v_data_array
(44),
p_c045 => v_data_array
(45),
p_c046 => v_data_array
(46),
p_c047 => v_data_array
(47),
p_c048 => v_data_array
(48),
p_c049 => v_data_array
(49),
p_c050 => v_data_array
(50)
-- Clear the line
v_line := NULL;
END IF;
END LOOP;
END;
END;
This package is from AskTom web site.
Modified a bit.
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type owaSylkArray is table of varchar2(2000);
procedure show(
p_query in varchar2,
p_parm_names in owaSylkArray default owaSylkArray(),
p_parm_values in owaSylkArray default owaSylkArray(),
p_sum_column in owaSylkArray default owaSylkArray(),
p_max_rows in number default 10000,
p_show_null_as in varchar2 default null,
p_show_grid in varchar2 default 'YES',
p_show_col_headers in varchar2 default 'YES',
p_font_name in varchar2 default 'Courier New',
p_widths in owaSylkArray default owaSylkArray(),
p_titles in owaSylkArray default owaSylkArray(),
p_strip_html in varchar2 default 'YES' );
procedure show(
p_cursor in integer,
p_sum_column in owaSylkArray default owaSylkArray(),
p_max_rows in number default 10000,
p_show_null_as in varchar2 default null,
p_show_grid in varchar2 default 'YES',
p_show_col_headers in varchar2 default 'YES',
p_font_name in varchar2 default 'Courier New',
p_widths in owaSylkArray default owaSylkArray(),
p_titles in owaSylkArray default owaSylkArray(),
p_strip_html in varchar2 default 'YES' );
PROCEDURE get_usable_sql (p_sql_in IN VARCHAR2, p_sql_out OUT VARCHAR2);
end ols_print_sylk_format;
CREATE OR REPLACE PACKAGE BODY "OLS_PRINT_SYLK_FORMAT" as
g_cvalue varchar2(32767);
g_desc_t dbms_sql.desc_tab2;
type vc_arr is table of varchar2(2000) index by binary_integer;
g_lengths vc_arr;
g_sums vc_arr;
procedure p( p_str in varchar2 )
is
len NUMBER;
begin
htp.p(p_str);
--dbms_output.put_line(p_str);
exception
when others then null;
end;
function build_cursor(
q in varchar2,
n in owaSylkArray,
v in owaSylkArray ) return integer is
c integer := dbms_sql.open_cursor;
i number := 1;
begin
dbms_sql.parse (c, q, dbms_sql.native);
loop
dbms_sql.bind_variable( c, n(i), v(i) );
i := i + 1;
end loop;
return c;
exception
when others then
return c;
end build_cursor;
function str_html ( line in varchar2 ) return varchar2 is
x varchar2(32767) := null;
in_html boolean := FALSE;
s varchar2(3);
begin
if line is null then
return line;
end if;
for i in 1 .. length( line ) loop
s := substr( line, i, 1 );
if in_html then
if s = '>' then
in_html := FALSE;
end if;
else
if s = '<' then
in_html := TRUE;
end if;
end if;
if not in_html and s != '>' then
x := x || s;
end if;
end loop;
return x;
end str_html;
function ite( b boolean,
t varchar2,
f varchar2 ) return varchar2 is
begin
if b then
return t;
else
return f;
end if;
end ite;
procedure print_comment( p_comment varchar2 ) is
begin
return;
p( ';' || chr(10) || '; ' || p_comment || chr(10) || ';' );
end print_comment;
procedure print_heading( font in varchar2,
grid in varchar2,
col_heading in varchar2,
titles in owaSylkArray )
is
l_title varchar2(2000);
begin
p( 'ID;DBSWHWEBSHOP' );
print_comment( 'Fonts' );
p( 'P;F' || font || ';M200' );
p( 'P;F' || font || ';M200;SB' );
p( 'P;F' || font || ';M200;SUB' );
print_comment( 'Global Formatting' );
--p( 'F;C1;FG0R;SM1' ||
p( 'F;C1;FG0L;SM0' ||
ite( upper(grid)='YES', '', ';G' ) ||
ite( upper(col_heading)='YES', '', ';H' ) );
for i in 1 .. g_desc_t.count loop
--p( 'F;C' || to_char(i+1) || ';FG0R;SM0' );
p( 'F;C' || to_char(i+1) || ';FG0L;SM0' );
end loop;
print_comment( 'Title Row' );
p( 'F;R1;FG0C;SM2' );
for i in 1 .. g_desc_t.count loop
g_lengths(i) := g_desc_t(i).col_name_len;
g_sums(i) := 0;
begin
l_title := titles(i);
exception
when others then
l_title := g_desc_t(i).col_name;
end;
if i = 1 then
--p( 'C;Y1;X2;K"' || l_title || '"' );
p( 'C;Y1;X1;K"' || l_title || '"' );
else
--p( 'C;X' || to_char(i+1) || ';K"' || l_title || '"' );
p( 'C;X' || to_char(i) || ';K"' || l_title || '"' );
end if;
end loop;
end print_heading;
function print_rows(
c in integer,
max_rows in number,
sum_columns in owaSylkArray,
show_null_as in varchar2,
strip_html in varchar2 ) return number is
row_cnt number := 0;
line varchar2(32767) := null;
n number;
begin
loop
exit when ( row_cnt >= max_rows or
dbms_sql.fetch_rows( c ) <= 0 );
row_cnt := row_cnt + 1;
print_comment( 'Row ' || row_cnt );
p( 'C;Y' || to_char(row_cnt+1) );
for i in 1 .. g_desc_t.count loop
dbms_sql.column_value( c, i, g_cvalue );
g_cvalue := trim( both chr(10) from g_cvalue );
g_cvalue := trim( both chr(13) from g_cvalue );
g_cvalue := translate( g_cvalue,
chr(13)||chr(10)||chr(9)||';', ' ' );
g_cvalue := ite( upper( strip_html ) = 'YES',
str_html( g_cvalue ),
g_cvalue );
g_lengths(i) := greatest( nvl(length(g_cvalue),
nvl(length(show_null_as),0)),
g_lengths(i) );
line := 'C;X' || to_char(i);
line := line || ';K';
begin
n := to_number( g_cvalue );
if upper( sum_columns(i)) = 'Y' then
g_sums(i) := g_sums(i) + nvl(n,0);
end if;
exception
when others then
n := null;
end;
line := line ||
ite( n is null,
ite( g_cvalue is null,
'"'||show_null_as||
'"', '"'||g_cvalue||'"' ),
n );
p( line );
end loop;
end loop;
return row_cnt;
end print_rows;
procedure print_sums(
sum_columns in owaSylkArray,
row_cnt in number ) is
begin
if sum_columns.count = 0 then
return;
end if;
print_comment( 'Totals Row' );
p( 'C;Y' || to_char(row_cnt + 4) );
p( 'C;X1;K"Totals:"' );
for i in 1 .. g_desc_t.count loop
begin
if upper(sum_columns(i)) = 'Y' then
p( 'C;X' || to_char(i+1) || ';ESUM(R3C:R' ||
to_char(row_cnt+2) || 'C)' );
end if;
exception
when others then
null;
end;
end loop;
end print_sums;
procedure print_widths( widths owaSylkArray ) is
begin
print_comment( 'Format Column Widths' );
--p( 'F;W1 1 7' );
for i in 1 .. g_desc_t.count loop
begin
--p( 'F;W' || to_char(i+1) || ' ' ||
--to_char(i+1) || ' ' ||
p( 'F;W' || to_char(i) || ' ' ||
to_char(i) || ' ' ||
to_char(to_number(widths(i))) );
exception
when others then
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--to_char(i+1) || ' ' ||
p( 'F;W' || to_char(i) || ' ' ||
to_char(i) || ' ' ||
greatest( g_lengths(i), length( g_sums(i) )));
end;
end loop;
p( 'E' );
end print_widths;
procedure show(
p_cursor in integer,
p_sum_column in owaSylkArray default owaSylkArray(),
p_max_rows in number default 10000,
p_show_null_as in varchar2 default null,
p_show_grid in varchar2 default 'YES',
p_show_col_headers in varchar2 default 'YES',
p_font_name in varchar2 default 'Courier New',
p_widths in owaSylkArray default owaSylkArray(),
p_titles in owaSylkArray default owaSylkArray(),
p_strip_html in varchar2 default 'YES' ) is
l_row_cnt number;
l_col_cnt number;
l_status number;
begin
dbms_sql.describe_columns2( p_cursor, l_col_cnt, g_desc_t );
for i in 1 .. g_desc_t.count loop
dbms_sql.define_column( p_cursor, i, g_cvalue, 32765);
end loop;
print_heading( p_font_name,
p_show_grid,
p_show_col_headers,
p_titles );
l_status := dbms_sql.execute( p_cursor );
l_row_cnt := print_rows(
p_cursor,
p_max_rows,
p_sum_column,
p_show_null_as,
p_strip_html );
print_sums( p_sum_column, l_row_cnt );
print_widths( p_widths );
end show;
procedure show(
p_query in varchar2,
p_parm_names in owaSylkArray default owaSylkArray(),
p_parm_values in owaSylkArray default owaSylkArray(),
p_sum_column in owaSylkArray default owaSylkArray(),
p_max_rows in number default 10000,
p_show_null_as in varchar2 default null,
p_show_grid in varchar2 default 'YES',
p_show_col_headers in varchar2 default 'YES',
p_font_name in varchar2 default 'Courier New',
p_widths in owaSylkArray default owaSylkArray(),
p_titles in owaSylkArray default owaSylkArray(),
p_strip_html in varchar2 default 'YES' ) is
begin
show( p_cursor => build_cursor( p_query,
p_parm_names,
p_parm_values ),
p_sum_column => p_sum_column,
p_max_rows => p_max_rows,
p_show_null_as => p_show_null_as,
p_show_grid => p_show_grid,
p_show_col_headers => p_show_col_headers,
p_font_name => p_font_name,
p_widths => p_widths,
p_titles => p_titles,
p_strip_html => p_strip_html );
end show;
PROCEDURE get_usable_sql (p_sql_in IN VARCHAR2, p_sql_out OUT VARCHAR2)
IS
v_sql VARCHAR2 (32767);
v_names DBMS_SQL.varchar2_table;
v_pos NUMBER;
v_length NUMBER;
v_exit NUMBER;
BEGIN
v_sql := p_sql_in;
v_names := wwv_flow_utilities.get_binds (v_sql);
FOR i IN 1 .. v_names.COUNT
LOOP
<<do_it_again>>
v_pos := INSTR (LOWER (v_sql), LOWER (v_names (i)));
v_length := LENGTH (LOWER (v_names (i)));
v_sql :=
SUBSTR (v_sql, 1, v_pos - 1)
|| v_names (i)
|| SUBSTR (v_sql, v_pos + v_length);
v_sql :=
REPLACE (v_sql,
UPPER (v_names (i)),
'(SELECT v('''
|| LTRIM (v_names (i), ':')
|| ''') FROM DUAL)'
IF INSTR (LOWER (v_sql), LOWER (v_names (i))) > 0
THEN
GOTO do_it_again;
END IF;
END LOOP;
p_sql_out := v_sql;
END get_usable_sql;
end ols_print_sylk_format;
CREATE OR REPLACE PROCEDURE "PRINT_SYLK" AS
v_region_sql VARCHAR2(32767);
v_plug_source_type VARCHAR2(32767);
v_filenm VARCHAR2(2000);
l_cursor NUMBER := dbms_sql.open_cursor;
BEGIN
SELECT region_source, source_type
INTO v_region_sql, v_plug_source_type
FROM apex_application_page_regions
WHERE region_id = to_number(LTRIM(v('REGIONID'), 'R'))
AND page_id = v('APP_PAGE_ID');
-- Apex 2.1 if v_plug_source_type like 'SQL%' then
if v_plug_source_type like 'Report' then -- Apex 3.2.1
ols_print_sylk_format.get_usable_sql(v_region_sql, v_region_sql);
else
v_region_sql := upper(v_region_sql);
v_region_sql := replace(v_region_sql,'BEGIN',' ');
v_region_sql := replace(v_region_sql,'RETURN ',' ');
v_region_sql := replace(v_region_sql,';',' ');
v_region_sql := replace(v_region_sql,'END',' ');
execute immediate 'select ' || v_region_sql ||
' from dual ' into v_region_sql;
end if;
v_filenm := v('EXCELNAME') || '.xls';
owa_util.mime_header('application/vnd.ms-excel', FALSE);
-- Set up HTTP header
htp.p('Content-Disposition: attachment; filename="' || v_filenm || '"');
-- Close the headers
owa_util.http_header_close;
dbms_sql.parse(l_cursor, v_region_sql, dbms_sql.native);
ols_print_sylk_format.SHOW(p_cursor => l_cursor, p_max_rows => 60000);
dbms_sql.close_cursor(l_cursor);
HTMLDB_APPLICATION.g_unrecoverable_error := TRUE;
END PRINT_SYLK;
How can i remove it.
Thanks -
Where can I learn more about Siri?
Siri works pretty well for me (for a Beta component) since I do not have a strong regional accent, but I want to learn more about what it can do, how best to pose questions for successful interactions and follow its progress as it is updated by Apple. Any suggestions for good resources?
Here's a place to start: Learn more about Siri
-
to the left of the URL are 3 balls, red, yellow, green, that go around in a circle. when i click on them it says download helper, what is that for and how do I learn more about them?
Thanks, this is very helpful, and resolved my question
dan -
I would like to learn more about the API associated with contract and pric
Hi
I would like to learn more about the API associated with contract and pricing agreements in advanced pricing modules os Oracle 11i and also get functional knowledge.
Please note that, I have almost no knowledge about oracle oracle ERP system.
Please advice, where do I start.
thanks
sivaPlease read Oracle Applications Developer's Guide .
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I'm considering FileVault usage on an iMac with OSX 10.6.7. Wanting to know more about strengths and weaknesses of Filevault with Time Machine, Parallels and Carbon Copy Cloner. Any negatives to consider before flipping the switch? Any information ?
Would specifically like to know:
Filevault impact on performance and application usability.
TIme machine impacts, and whether TIme Machine volume will also be secure?
Will a Cloned copy made with CCC be bootable, or usable?
Any other negatives to consider before turning this thing on?
Thanks,Filevault impact on performance and application usability.
FileVault encrypts the user's home directory only - it is basically an encrypted disk image that is automatically opened when you log in and closed when you log out. It does cause disk accesses to be a bit slower so it isn't a good idea to use an encrypted account with sound or video or large graphics files. I have no experience with it with Parallels Desktop but suspect that you'd notice a bit of a slowdown. Note: in the User's directory you'll see a Shared Folder. Since FV only encrypts the user's directory you can put data you don't need encrypted in this shared folder which won't be encrypted.
TIme machine impacts, and whether TIme Machine volume will also be secure?
There are issues with TM and FV but how extensive they are with Snow Leopard I can't say, once I realized that TM and FV hadn't substantially changed between 10.5 and 10.6 I stopped dealing with it. When FV and TM were first introduced my testing led me to recommend using CCC or SuperDuper! for backing up.
Will a Cloned copy made with CCC be bootable, or usable?
Yes
Any other negatives to consider before turning this thing on?
Since FV is nothing more than a disk image - and disk images can fail - there are several problems with FV in my opinion. If an encrypted disk image fails it isn't possible to access any of that data. If you don't have a recent (undamaged) backup of the disk image and/or recent backup of the data within the disk image you are in a world of hurt. This isn't just a warning of possibility - this is a real danger that I've seen all too often at the shop where I have worked part time for a number of years.
At this time I strongly recommend that people who have sensitive data keep that sensitive data segregated from their general data and encrypt only the sensitive data or use other methods of locking it down such as saving on an external drive that is kept in a safe. Call me paranoid but I don't even keep all my sensitive data in one encrypted disk image. I use multiple disk images and keep multiple sequential backups. That way I might someday find that my up-to-date investments disk image won't mount but (a) I can go back a week to a backup and (b) that won't impact my up-to-date business records because those are in a different disk image
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