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Discover how to easily create an N-by-1 cell array of `empty character vectors` in MATLAB using the repmat function.
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Creating a Cell Array of Empty Character Vectors in MATLAB

If you are working with MATLAB and need to create an N-by-1 cell array filled with empty character vectors, you might find that the typical methods don't yield the desired results. For instance, while using cellstr(repmat('', 2, 1)) might seem like a plausible approach, it doesn't actually provide you with the expected empty cell array. Instead, it results in an unexpected output that can lead to confusion and errors down the line. In this post, we'll explore how to correctly create a cell array filled with empty character vectors, ensuring you avoid common pitfalls along the way.

The Problem

You might have faced something similar during your MATLAB coding sessions:

You try to create a cell array that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

However, common methods like cellstr(repmat('', 2, 1)) yield unexpected results, giving you an empty cell instead of a cell array of empty strings.

This can lead to errors when you try to use the array for mapping keys and values, as shown in the example below:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

Fortunately, there's a straightforward solution that addresses this issue effectively. Instead of creating arrays from empty strings directly, you can utilize the repmat function in a slightly different manner.

Using repmat with a Cell Array

To create an N-by-1 cell array containing empty character vectors, you can use the following syntax:

[[See Video to Reveal this Text or Code Snippet]]

Here's how it works:

{''}: This creates a cell array containing a single empty character vector.

repmat({''}, 2, 1): This replicates the cell containing the empty string; in this case, it creates a 2-by-1 cell array, which looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Example Usage

Here’s an example of how you could implement this in your code:

[[See Video to Reveal this Text or Code Snippet]]

This will return the output:

[[See Video to Reveal this Text or Code Snippet]]

Now that you have your empty cell array, you can use it in other operations without encountering any key-value mismatch errors.

Conclusion

Creating a cell array of empty character vectors in MATLAB can be puzzling with standard methods. However, by utilizing repmat on a cell array containing an empty string, you can easily achieve your goal. This approach offers a clear and effective way to manage empty cell variables, helping streamline your coding tasks in MATLAB.

Feel free to experiment with different sizes by adjusting the parameters in the repmat function, and enjoy coding with clearer, error-free cell arrays!