Maths made me mad. IT is only for the geeks. You are not alone, and I seek to reach out to those who understand the woes. I am no expert but I just share what I know or how I solve the problems - A novice's solutions to typical maths.IT problems. If statistics and software drive you crazy, I hope this site would put you back to sanity.
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Sunday, September 11, 2011
iphone vs Android: which group do you belong ?
I am waiting for iphone 5. Is it worth waiting for ? @__@
"Sorry, the import failed due to a server error. The error code is bX-izedxv".
You received the above error message when trying to export your Wordpress .xml file into Blogger/Blogspot.
Tuesday, August 30, 2011
Pathetic Page Views
This week's page view :
Only 24 page views in total this week (as at 30 Aug 2011).
How pathetic is that.
Should I continue this blog ? =(
Monday, August 29, 2011
How to link data in 2 excel files and combine them into 1 using macro?
FILE 1
data: Column A, B and C
FILE 2
data: Column A, and D
Use FILE 1 as the primary file.
Final Result: should have A , B C and D together in 1 spreadsheet.
Problem : Look up function but seems like it doesn't work well. the data is jumble up. I still to check using True false function. cos what is avai in A may not be found in B.
Pri file has more information ( in terms of number of names ) than file 2.
name data1 data2 data3
and in file 2:
name data1 data2 data3 data4
data: Column A, B and C
FILE 2
data: Column A, and D
Use FILE 1 as the primary file.
Final Result: should have A , B C and D together in 1 spreadsheet.
Problem : Look up function but seems like it doesn't work well. the data is jumble up. I still to check using True false function. cos what is avai in A may not be found in B.
Pri file has more information ( in terms of number of names ) than file 2.
name data1 data2 data3
and in file 2:
name data1 data2 data3 data4
Sunday, August 28, 2011
Macro - ADD 3 rows & UNDO Macro to undo the addition of 3 rows
To do the following :
a) ADD 3 Rows
(or even more rows) by prompting user to enter the number of rows they wish to insert.
b) UNDO MACRO:
1. Undo the addition/insertion of rows
2. when click, it will also prompt: "Do you want to undo adding 3 rows ?"
> Yes | Cancel
if Yes, macro proceed and if Cancel , macro will not run and remain.
a) ADD 3 Rows
(or even more rows) by prompting user to enter the number of rows they wish to insert.
b) UNDO MACRO:
1. Undo the addition/insertion of rows
2. when click, it will also prompt: "Do you want to undo adding 3 rows ?"
> Yes | Cancel
if Yes, macro proceed and if Cancel , macro will not run and remain.
Saturday, August 27, 2011
Mathematical Expectation
Question 4.53
Suppose that a grocery store purchases 5 cartons of skim milk at the wholesale price of $1.20 per carton and retails the milk at $1.65 per carton After the expiration date, the unsold milk is removed from the shelf and the grocer receives a credit from the distributor equal to 3/4 of the wholesale price. If the probability distribution of the random variable X, the number of cartons that are sold from this lot is:
Find the Expected Profit.
Suppose that a grocery store purchases 5 cartons of skim milk at the wholesale price of $1.20 per carton and retails the milk at $1.65 per carton After the expiration date, the unsold milk is removed from the shelf and the grocer receives a credit from the distributor equal to 3/4 of the wholesale price. If the probability distribution of the random variable X, the number of cartons that are sold from this lot is:
x | 1 | 2 | 3 | 4 | 5 |
f(x) | 1/15 | 2/15 | 3/15 | 4/15 | 5/15 |
Find the Expected Profit.
Enriching Vocabulary 1
Words beginning with au~:
1. audacious - daring; often to a degree that is considered foolish.
It was audacious of the student to talk back to his principal, especially when he was clearly in the wrong.
2. augment - to cause to become bigger, better, more valuable
To augment the income of the family, he took up several part-time jobs.
3. augur - to be a sign of something in the future
The lack of lustre in the stars does not augur well for his fortunes.
4. aura - an effect/feeling that seems to surround / come from a person/place
There was a strangely mysterious aura exuding from the ancient museum.
5. auspices - help, support and favour
This concert was held successfully only because of the auspices of the various organisations.
6. austere - plain, without comfort/enjoyment.
The monks are used to an austere life in the mountains.
7. authentic - genuine
The expert judged this to be an authentic piece of work.
8. auxiliary - providing additonal help/support, especially with lower rank or of less importance.
Auxiliary nurses were called in to cope with the sudden emergencies in the hospital.
9. auburn - reddish-brown
My sister has a nice auburn hair.
10. auspicious - giving, promising or showing signs of future success
The Chinese believe red to be an auspicious colour.
1. audacious - daring; often to a degree that is considered foolish.
It was audacious of the student to talk back to his principal, especially when he was clearly in the wrong.
2. augment - to cause to become bigger, better, more valuable
To augment the income of the family, he took up several part-time jobs.
3. augur - to be a sign of something in the future
The lack of lustre in the stars does not augur well for his fortunes.
4. aura - an effect/feeling that seems to surround / come from a person/place
There was a strangely mysterious aura exuding from the ancient museum.
5. auspices - help, support and favour
This concert was held successfully only because of the auspices of the various organisations.
6. austere - plain, without comfort/enjoyment.
The monks are used to an austere life in the mountains.
7. authentic - genuine
The expert judged this to be an authentic piece of work.
8. auxiliary - providing additonal help/support, especially with lower rank or of less importance.
Auxiliary nurses were called in to cope with the sudden emergencies in the hospital.
9. auburn - reddish-brown
My sister has a nice auburn hair.
10. auspicious - giving, promising or showing signs of future success
The Chinese believe red to be an auspicious colour.
Friday, August 26, 2011
Create a macro to convert multiple .txt file and place all data from text to .xls file
- Convert multiple .txt files in a folder
- Delimit the .txt files so that there are headers in each column
- Format for date (1st column) should be in DD-MM-YY format
- Place all data from .txt files into 1 .xls file
- Scan through the data in .xls file
- Ensure all data are unique (ie. no repeated data in each row)
Thursday, August 25, 2011
Error in Renaming Folder in Windows Explorer
Rename a folder but the error states :
However, owner is under my name and I have full rights to the folder.
The files in the folder are not even opened.
How ?
Cannot rename ____ : Access is denied.
Make sure the disk is not full or write-protected and that the file is not currently in use.
However, owner is under my name and I have full rights to the folder.
The files in the folder are not even opened.
How ?
Wednesday, August 24, 2011
Comparing sets of data (lower and upper limit)
Data set:
0.5, 1.5, 2.1, 0.43, 0.35
condition/base number : 1
Result needed:
To select number nearest to 1 ie.= 0.5 by using macro.
Note: Although 1.5 is also near to 1 (also a 0.5 difference), it must choose the smaller number.
(0.5 is smaller as compared to 1.5)
0.5, 1.5, 2.1, 0.43, 0.35
condition/base number : 1
Result needed:
To select number nearest to 1 ie.= 0.5 by using macro.
Note: Although 1.5 is also near to 1 (also a 0.5 difference), it must choose the smaller number.
(0.5 is smaller as compared to 1.5)
Saturday, August 20, 2011
Random Variables and Probability Distribution
Question 3.32
The proportion of the budgets for a certain type of industrial company that is allocated to environmental and pollution control is coming under scrutiny. A data collection project determines that the distribution of these proportions is given by:
f (y) = 5 (1-y)^4, 0<=y<=1
0, elsewhere
a) Verify that the above is a valid density
b) What is the probability that a company chosen at random expends less than 10% of its budget on environmental and pollution controls ?
c) What is the probability that a company selected at random spends more than 50% on environmental and pollution control ?
The proportion of the budgets for a certain type of industrial company that is allocated to environmental and pollution control is coming under scrutiny. A data collection project determines that the distribution of these proportions is given by:
f (y) = 5 (1-y)^4, 0<=y<=1
0, elsewhere
a) Verify that the above is a valid density
b) What is the probability that a company chosen at random expends less than 10% of its budget on environmental and pollution controls ?
c) What is the probability that a company selected at random spends more than 50% on environmental and pollution control ?
Thursday, August 18, 2011
How do I extract selected text from a string of text?
Data in a cell and need to extract part of it :
Examples:
1. AERO 030405A AUTO 24567AZ 99AM > Extract 67
2. AERO 030405Z AUTO 25611C22AZ 99BM > Extract 11
Examples:
1. AERO 030405A AUTO 24567AZ 99AM > Extract 67
2. AERO 030405Z AUTO 25611C22AZ 99BM > Extract 11
Wednesday, August 17, 2011
AS400 / DB2 Programming Tutorial Guide
My favourite guides are :
Tutorial for AS400
http://www.texas400.com/tu tas400toc. html
Tutorial/book on DB2
http://publib.boulder.ibm. com/cgi-bi n/bookmgr_ OS390/BOOK S/ DSNAPH11 /CCONTENTS
Let me know if you have more to share.
I am still learning -__-
Tutorial for AS400
http://www.texas400.com/tu
Tutorial/book on DB2
http://publib.boulder.ibm.
Let me know if you have more to share.
I am still learning -__-
Tuesday, August 16, 2011
Probability
Question 2.26
A California study concluded that by following 7 simple health rules a man's life can be extended by 11 years n the average and a woman's life by 7 years. These 7 rules are as follows: no smoking, regular exercise, use alcohol moderately, get 7-8 hours of sleep, maintain proper weight, eat breakfast, and do not eat between meals. In how many ways can a person adopt five of these rules to follow
a) If the person presently violates all 7 rules?
b) If the person never drinks and always eats breakfast?
A California study concluded that by following 7 simple health rules a man's life can be extended by 11 years n the average and a woman's life by 7 years. These 7 rules are as follows: no smoking, regular exercise, use alcohol moderately, get 7-8 hours of sleep, maintain proper weight, eat breakfast, and do not eat between meals. In how many ways can a person adopt five of these rules to follow
a) If the person presently violates all 7 rules?
b) If the person never drinks and always eats breakfast?
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