Shahida kak

One common error you may encounter in R is:

This error usually occurs for one of two reasons:

Reason 1: You are attempting to reference an object you have not created.

Reason 2: You are running a chunk of code where the object has not been defined in that chunk.

The following examples how to resolve this error in each of these scenarios.

Suppose we use the following code to display a data frame that we have not created:

We receive an error because the object my_data does not exist.

Instead, we need to type the correct name of the data frame that we created:

This time we’re able to display the data frame without an error because we used the correct name.

Note that we can also use ls() to display all object names in our current environment and exists() to check if a specific object name exists:

We can see that exists(‘my_data’) returns FALSE, which explains why we received an error when we attempted to display it.

Another reason that we might receive an object not found error is because we have highlighted a chunk of code to run in RStudio that doesn’t contain the name of the object we’re attempting to reference.

For example, consider the following screenshot where we highlight rows 3 through 5 and attempt to calculate the mean of a value named x:

Since we created the vector named x in row 2, we receive an error because we haven’t actually created that vector in the chunk of code that we highlighted.

If we instead make sure that we highlight the whole chunk of code we’re interested in, we won’t receive any error:

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Most modern laptops come with backlit keyboards designed to make typing in low-light conditions easier. Most keyboards have backlight illumination and glowing letters but, sometimes, this neat feature will refuse to work. If that’s the case with your laptop, the problem is usually not with the keyboard.

If you’re a Windows 10 user, the backlit keyboard feature is most probably turned off in the Settings app. You just need to know where settings are and adjust them. Keep reading and learn how to manage your backlit keyboard in Windows 10.

There are several ways to enable keyboard backlights and change their brightness in Windows 10. These options vary depending on the make and model of your Windows laptop.

One is via the Windows Mobility Center, and another is through the native app that comes with your laptop. Let’s see how they work.

The first method requires you to open the Control Panel and navigate to the Windows Mobility Center to get the backlight working on your laptop. Here is what you have to do:

Most laptops come with native apps for managing keyboard backlight brightness. If you are not sure if you have such an app, you can always check the system. Connect to the internet and type in the name of your laptop in your browser’s search bar. Add the phrase Enable Keyboard Backlight Windows 10, and you should be able to find the settings right away.

Depending on the model, your computer probably has a keyboard function to turn on the backlight.

Again, depending on the model of your Dell, there are various keyboard functions to activate your keyboard’s backlight.

Alt+F10

Fn+F10

F10

Fn+F6

Fn+F5

Fn+F4 or F5

One of the easiest ways to know whether or not your laptop has a keyboard backlight is to look at the keyboard itself, if you see any of the symbols by the manufacturer in the screenshots above then you can enable the backlight.

Absolutely. Most wireless keyboards can connect to most laptops using Bluetooth or a USB port.

Some Windows 10 users reported that the keyboard backlight settings don’t work. It’s not clear what causes the issue, but if you’re one of the unlucky users who have that problem, you can always troubleshoot for possible solutions. Here is what you have to do:

Other causes of your keyboard backlight woes can be attributed to hardware issues or even software updates. If your backlight no longer works after a drop it may be as simple as a loose cable. If you’ve performed an update recently power cycle your computer to see if it will turn back on.

Windows 10 blocks the keyboard backlight feature on some laptops automatically. It’s unclear why that happens, but with the simple methods described above, you will be able to turn it on and choose the brightness level you want at any time. The process is simple and takes only a minute or two to complete. You can finally type like a pro in the dark.