In NumPy, -1 in reshape(-1) refers to an unknown dimension that the reshape() function calculates for you. It is like saying: “I will leave this dimension for the reshape() function to determine”. A common use case is to flatten a nested array of an unknown number of elements to a 1D array. For example: But […]
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In NumPy, the @ operator means matrix multiplication. For instance, let’s multiply two NumPy arrays that represent 2 x 2 matrices: Output: If you are familiar with matrix multiplication, I’m sure this answers your questions. However, if you do not know what matrix multiplication means, or if you are interested in how the @ operator
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To transpose a matrix with NumPy, call the transpose() method. For instance: Output: If you are in a hurry, I’m sure this quick answer is enough. To learn more about matrix transpose, keep on reading. What Is the Transpose of a Matrix The transpose of a matrix is another matrix where the matrix is flipped
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To concatenate two arrays with NumPy: For instance: Output: This is a quick answer. To learn more ways to concatenate arrays and about their efficiency, please, stick around. 4 Ways to Concatenate 1D NumPy Arrays There are four built-in ways to concatenate arrays in NumPy. Before introducing these, it is important you understand that all
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To check if two NumPy arrays A and B are equal: For example: This is the easiest approach to comparing two arrays. But this approach is not 100% reliable. Instead, you should consider using the built-in np.array_equal() function for good measure. This always produces the right result. In this guide, you learn how to compare
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To turn yourself into a full-time blogger, you have to be good at monetizing your blog. One of the predominant approaches to monetizing a blog is by displaying ads. Showing ads is great because it allows for a passive income stream. What could be better than making money while you sleep? In the past, the
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To resize an image using OpenCV, use the cv2.resize() function. To do this: Read an image into your program. Specify a scaling factor. Multiply the width and the height by the scaling factor. Call cv2.resize() function with the new dimensions Here is a quick cheat sheet for resizing images in four ways: Next, let’s take
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In Python, slicing is used to access specific parts of an iterable, such as a list. Here are some examples: But how does the slicing notation work? There are two syntaxes you can use the slice notation in Python: Let’s take a look at how both of these work. [start:stop] The slicing notation [start:stop] means
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To pass a function as a parameter into another function in Swift, the accepted parameter type needs to describe a function. For instance, this function accepts two regular parameters and a function parameter: Now you can call this function by passing it an argument that is any function that takes two doubles and returns a
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Knowing the best coding websites is important to maximize learning and streamline the coding progress. More importantly, if you are a beginner, you need to know where to get started at. There are great websites for both beginner coders as well as professional developers. Whether you’re looking to start programming from scratch or to sharpen
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