I want to draw real-time data from the serial port. I think R is a good tool for this job. I encountered a stumbling block while trying to read data from the serial port (COM4) I have verified that the data is entered via terra term (and closed the session before trying R), but I can’t seem to get anything in R.
Tag: data
iPhone – Core Data Concurrent (NSOpe)
wrote in Apple docs:
…you should create the context in
main ( for a serial queue) or start
(for a concurrent queue).
But I really don’t get any difference. Why can’t I create a contex
iPhone – Core Data NSPredicate and SQLITE Store
This code returns 0 incorrect objects. However, when the predicate is deleted, the get request will return all objects.
NSError *error = nil;
NSEntityDescription *entityDescription = [NSEntit
RSQLite and read data into memory
I may have overlooked something, but when using the RSQLite package, can I still use the special string “:memory:” in the R script to speed up data retrieval? Yes, it can still use the special s
PowerDesigner Export Data Structure to Word
First, let’s briefly introduce how to export tables to Excel.
The first step is to find the Report tab and select Generate Report.
< /p> The second step, select RTF that supports word f
SQLite – insert the data into the blob
I am trying to use SQLite3 shell to insert binary data into blobs, which means regular SQL statements. This is my table:
CREATE TABLE MYTABLE
(ID INTEGER,
BINDATA BLOB NOT NULL,
SOMEFK INT
How do I retrieve data from SQLITE to VB6?
I use SQLite3 ODBC driver as my connection string,
Dim conn As ADODB.Connection Set conn = New ADODB.Connection
Dim rs As New ADODB.Recordset
Set conn = New ADODB.Connection
conn.ConnectionSt
PowerDesigner configures Oracle Data Source Reverse Project Export PDM File
System: win7 64 bit; Oracle 10g; Powerdesigner 15
The problem, in the control panel =>Management Tools=>Data Source (ODBC) Add “User DNS” configuration driver to oracle can connect successful
PowerDesigner generates data structural diagrams and corresponding SQL export methods
1. Download powerDesigner
The link address is http://soft.onlinedown.net/soft/577763.htm
2. Open the software, file -> new project, create a new project; then create a new entity to bui
PowerDesigner (5) – Concept Data Model (CDM Generate LDM, PDM and OOM)
The original text is from: http://www.voidcn.com/article/p-avzfndrz-oy.html
Conceptual Data Model (CDM): expresses the overall logical structure of data, which is independent of any software