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How to save a data.frame in R?
...ta.Rda")
Then load it with:
load("data.Rda")
You could also use write.table() or something like that to save the table in plain text, or dput() to obtain R code to reproduce the table.
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Fastest Way to Find Distance Between Two Lat/Long Points
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Create your points using Point values of Geometry data types in MyISAM table. As of Mysql 5.7.5, InnoDB tables now also support SPATIAL indices.
Create a SPATIAL index on these points
Use MBRContains() to find the values:
SELECT *
FROM table
WHERE MBRContains(LineFromText(CONCAT(
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How do I specify unique constraint for multiple columns in MySQL?
I have a table:
14 Answers
14
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“’” showing on page instead of “ ' ”
...h is being decoded as CP-1252 instead of UTF-8. If you check the encodings table, then you see that this character is in UTF-8 composed of bytes 0xE2, 0x80 and 0x99. If you check the CP-1252 code page layout, then you'll see that each of those bytes stand for the individual characters â, € and ...
What is the difference between MOV and LEA?
...is answer is basically wrong because the question is asking about MOV AX, [TABLE-ADDR], which is a load. So there is a major difference. The equivalent instruction is mov ax, OFFSET table_addr
– Peter Cordes
Feb 27 '18 at 23:56
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Replace all 0 values to NA
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What would the equivalent syntax be for a data.table object?
– itpetersen
Dec 7 '14 at 5:33
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Correct way to use StringBuilder in SQL
...ink you've misquoted it, though; surely there aren't quotes around id2 and table?)
Note that the aim (usually) is to reduce memory churn rather than total memory used, to make life a bit easier on the garbage collector.
Will that take memory equal to using String like below?
No, it'll cause m...
How to add row in JTable?
Do you know how I can add a new row to a jTable ?
5 Answers
5
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Deleting all rows from Cassandra cql table [duplicate]
Is there a command to all the rows present in a cql table in cassandra like the one in sql?
1 Answer
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Quick Way to Implement Dictionary in C
...ection 6.6 of The C Programming Language presents a simple dictionary (hashtable) data structure. I don't think a useful dictionary implementation could get any simpler than this. For your convenience, I reproduce the code here.
struct nlist { /* table entry: */
struct nlist *next; /* next ent...