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Month: May 2009

Array formula to check if a number is prime [just for fun]

I am math-geek-wannabe, if there ever is such a category. During my 3rd year of graduation I went and purchased the volume 2 of Donald Knuth’s Art of Computer Programming and thus began my love with all things random and prime. I never really became the math-geek I always wanted to, instead I became an insurance expert with tons of passion for data and visualization. But when I get a chance to poke with randomness or numbers, I always lap it up with joy. And that brings us to an interesting array formula trick to check if a number is prime or not.

(assuming the number is in the cell B2) type the below formula and

=IF(MIN(MOD($B$5,ROW(INDIRECT(“2:”&INT(SQRT($B$5))))))=0,”not prime”,”prime”)

hit ctrl+shift+enter and bingo, it tells you if the number is prime or not. Read on to find how it works

Intraday Candlestick Charting [Stock Charts]

Gene asks me in an email, “I’m trying to graph candlestick charts in Excel for 10 minute candles. Excel seems to allow daily only with its stock templates. Can you point me to any resources for creating intraday candle charts?”. Of course, you can create intraday candlestick charts just the way you would create normal candlesticks, just change the axis options once you are done. Read the post to find more.

Hide Formula Errors While Printing [Quick tip]

Here is a quick excel printing tip. Use the page setup options from print preview area of the spreadsheet to select how you want to handle the formula errors when the worksheet is printed. You can set it to blank from the “sheet” tab of the page setup dialog in Microsoft excel

Do you know these Excel 2007 Productivity Secrets (Hint: Coffee is not one of them)

Do you know these excel 2007 productivity secrets? (1) How to turn on the clipboard pane so that you can do rapid copy pasting (2) How to lock a feature for repeated use (3) How to copy charts as pictures (4) How to features not on ribbon to the quick access tool bar (5) How to change the default file save settings so that excel always save files in earlier version and much more. Go ahead and read the secrets and become excel guru.

Now Edit Google Spreadsheets using MS Excel

Do you like the cool features of Google docs spreadsheets but too comfortable with MS Excel’s UI? Well, the supercool OffiSync add-in is for you. It is developed for Oudi Antebi an former marketing manager at Microsoft.

Once you finish the installation of the addin you will see a new ribbon in the corresponding applications (word, excel and powerpoint).