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Jed Cartwright

Answers by Jed Cartwright

Convert tabs to spaces in Notepad++?

To convert existing tabs to spaces, press Edit->Blank Operations->TAB to Space. If in the future you want to enter spaces instead o...

Best way to check if a character array is empty?

Given this code: char text[50]; if(strlen(text) == 0) {} Followed by a question about this code: memset(text, 0, sizeof(text)); if(s...

What do the single quotes in if [ `wc -c $i` -gt 3 ] mean??

Those are not single-quotes but rather backticks (`). You might want to search for 'Command Substitution' in bash's man. ...

How do I test for an empty JavaScript object??

ECMA 5+: // because Object.keys(new Date()).length === 0; // we have to do some additional check Object.keys(obj).length === 0 &&...

Big O Notation - O(nlog(n)) vs O(log(n^2))?

O(log(n^2)) is simply O(2 log(n)) = O(log(n)). It is a logarithmic function. Its value is much smaller than the linear function O(n). O(n...

How to create diagonal stripe patterns and checkerboard patterns??

For horizontal, vertical, diagonal stripes: fx = 1 / 20; % 1 / period in x direction fy = 1 / 20; % 1 / period in y direction Nx = 200; %...

R Language: How to print the first or last rows of a data set? [duplicate]?

If you want to print the last 10 lines, use tail(dataset, 10) for the first 10, you could also do head(dataset, 10) ...

Copy a System.Drawing.Bitmap into a region of WriteableBitmap?

Use WritableBitmap.WritePixels. This will prevent using unmanaged code. BitmapData Data = Bitmap.LockBits(new Rectangle(0, 0, Bitmap.Widt...

Should I use a text file or a database for a PHP visitor counter??

File counter - when just count. DB counter - when visit tracking, depenences, analysis, aggregation. Read file is really faster, when fil...

No targets . Stop?

You should define the "all" target with object files as dependencies, in order to run the command "make" or "make all". There are also som...

“RuntimeError: Found 0 files in subfolders of ”.. Error about subfolder in Pytorch?

Can you post the structure of your files? In your case, it is supposed to be: img_dir |_class1 |_a.jpg |_b.jpg |_class2 |_a.jpg |...

How to check Django version?

Django 1.5 supports Python 2.6.5 and later. If you're under Linux and want to check the Python version you're using, run python -V from t...

Is there a function in c that will return the index of a char in a char array??

strchr returns the pointer to the first occurrence, so to find the index, just take the offset with the starting pointer. For example: ch...

Pandas join issue: columns overlap but no suffix specified?

Your error on the snippet of data you posted is a little cryptic, in that because there are no common values, the join operation fails bec...

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose?

From your stack trace, EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) occurred because dispatch_group_t was released while it was ...