Apr 2014 20

I have had AT&T U-Verse internet for some time now and my current plan is supposed to allow me to achieve download speeds of up to 24 Mbps. However, when I’d test my speed using SpeedTest, my speed would fluctuated and sometimes be as low as 9 Mbps. I was testing over wi-fi which wouldn’t give you the same speeds as over ethernet cable but still, 9 mbps was a lot less than 24. An AT&T technician came to replace the power supply brick for my modem. I asked him to check my speeds and to fix them to achieve the correct speeds. He had a special device that allowed him to see how many wi-fi networks my laptop was picking up as well as what channel they were one. To improve performance, he suggested we change my modem’s wi-fi channel to one that wasn’t currently being used by neighboring networks, I guess to minimize or eliminate collisions. By logging into your modem from a browser, you can see your current channel and be able to switch to another channel.

wi-fi-channel

I was on channel 11, which no one else was on, but we changed it to channel 3, which no one else was on either, and retested the speed. The speed was better but still not great and although we were sitting right next to the modem, we weren’t getting a strong signal. We then tried channel 5, as shown above, and retested the speed. Now, I’m getting always 21+mbps down, as you can see below.

speed-test

 

Conclusion: if you’re not getting the speeds you’re paying for, try changing your wi-fi access point’s channel. There are 11 channels in total. If you don’t know what channels your neighbors are on, you can try changing the channel from 1 to 11 and testing the speed at each channel until you find a speed that is close to what you’re paying. You can also install NetStumbler to see what networks are available and what channels they are on. Even though your access point should auto-select a free channel, that channel may still not give you the speeds you expect. Also, test you connection speeds using a direct ethernet connection as this is what AT&T uses to determine connection speed.

 

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Mar 2014 21

Let’s say you want to match all href values in <a> tags in an HTML document. You might do something like

href=”.*”>

2

But that doesn’t work because the * is greedy and gets everything up until that last closing bracket on the first line. To fix this, make the * lazy but adding a question mark (?) after it.

href=”.*?”>

1

Notice now that we correctly get 3 matches instead of 2.

 

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Mar 2014 16

Recently I had to do my taxes and having an online store, I had to go through 9000 transactions in Paypal that I needed categorize. Paypal lets you download your transaction history as a csv (comma-delimited text) file with double quotes (“) as a text qualifier which is a standard format. Unfortunately, you can still run into problems if you have double quotes and commas in a field’s value as follows:

“Confirmed”,”8″”, 10″”, 12″” AR550 Gong Round Steel Shooting Target Set 1/2″” Thick ( AR500)”,”300977807743″,”0.00″,”0.00″,”0.00″,””,””,””,””,”Ebay”, ….

Notice that the 2nd field contains double quotes and commas as follows:

8″”, 10″”, 12″” AR550 Gong Round Steel Shooting Target Set 1/2″” Thick ( AR500)

The original text for this field is

8″, 10″, 12″ AR550 Gong Round Steel Shooting Target Set 1/2″ Thick ( AR500)

where the double quotes represent inches as a unit of measure and the comma indicates that there are multiple sizes (8 inch, 10 inch, and 12 inch). The double quotes were escaped with double quotes to indicated that the double quotes are part of the field’s value. However, a double quote followed by a comma messes everything up because there’s no way to know whether that comma is part of the field value or a field delimiter.

The fact that this field contains double quotes and commas breaks the csv format because it appears now that this row has more columns that those in other rows. This is one of many things that can break a csv file. To fix this and other issues, I have found that it is most easy to use a tool called CSV Easy. It’s fast and shows you clearly which rows need to be fixed. Here’s an example of the problem I faced earlier.

csv-easy-1

[..]

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Mar 2014 16

If you need a calculator that shows many calculations so that you don’t have to write down and remember what previous calculations were, you can use CalcTape. I have found it to be most useful.

calctape

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Mar 2014 12

When it comes to losing weight, the formula is quite simple. The amount of calories your body burns each day must be greater than the amount of calories you consume each day.

Calories Burned – Calories Consumed > 0

Calories are burned as you  go about your day to day and if you exercise (primarily cardiovascular).

Calories are consumed when you eat.

You have three options for satisfying the above formula:

  1. Eat as you normally do but exercise A LOT so as to burn more calories than you consume
  2. Don’t exercise at all but eat very little or very low fat / low calorie foods
  3. Do a combination of the above

[..]

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