B.1. Summary of changes

MATLAB 7 Release 14 with Service Pack 2 (R14SP2) includes several new features. The major focus of R14SP2 is on improving the quality of the product. This document doesn’t attempt to provide a complete specification of every single feature, but instead provides a brief introduction to each of them. For full details, you should refer to the MATLAB documentation (Release Notes).

R14SP2 refers to a specific version of MATLAB, the software that is commonly used for mathematical computations and programming. This version introduced several enhancements intended to improve the software's performance and usability. The aim of the release notes is to summarize key changes rather than explain every single detail, guiding users on where they can find more comprehensive information.

Think of this release as a car model update. Every year, car manufacturers introduce new features to improve safety or efficiency. The documentation is like a brochure that highlights these features without going into every technical detail. If you want to know everything about the car, you would consult the full manual.

1. Spaces before numbers - For example: A* .5, you will typically get a mystifying message saying that A was previously used as a variable. There are two workarounds: (a) Remove all the spaces: A*.5 (b) Or, put a zero in front of the dot: A * 0.5

This point highlights an important syntax issue in MATLAB. If you place a space before the decimal in a number, MATLAB may interpret this incorrectly and throw an error. To solve this, you can either eliminate the space entirely or use a zero before the decimal point.

Imagine telling someone 'I have 50 apples.' If you said 'I have 5 0 apples,' the listener might get confused, thinking there's a problem with your statement. In programming, spaces can cause similar confusion, so clarity is key.

2. RHS empty matrix - The right-hand side must literally be the empty matrix [ ]. It cannot be a variable that has the value [ ], as shown here: rhs = []; A(:,2) = rhs ??? Subscripted assignment dimension mismatch

In MATLAB, when you're assigning an empty matrix to another variable, you must use the exact syntax of an empty matrix [ ] and not refer to a variable that might hold this value. The distinction is critical for preventing errors in code execution.

Think of this as a recipe. If a recipe calls for an 'empty bowl' and you try to reference 'the empty bowl I used yesterday,' it might not be clear if your bowl is really empty or not. Precise language is essential in cooking, just as it is in programming.

3. New format option - We can display MATLAB output using two new formats: short eng and long eng. short eng – Displays output in engineering format that has at least 5 digits and a power that is a multiple of three.

format short eng pi ans = 3.1416e+000 long eng – Displays output in engineering format that has 16 significant digits and a power that is a multiple of three. format long eng pi ans = 3.14159265358979e+000

MATLAB now offers two different output formats for numbers, geared towards engineering applications: 'short eng' and 'long eng.' These formats ensure that numbers are displayed with a specific number of significant digits and in an engineering-friendly notation, making it easier for users to interpret results quickly.

Imagine you're reading a map with precise locations versus a simplified one. In engineering, precision matters, like ensuring that a bridge can hold a specified weight. Just as you need to measure correctly for construction, MATLAB allows you to display your results in a clear and precise manner.

4. Help - To get help for a subfunction, use

help function_name>subfunction_name In previous versions, the syntax was help function_name/subfunction_name This change was introduced in R14 (MATLAB 7.0) but was not documented. Use the MathWorks Web site search features to look for the latest information.

The method of accessing help for specific subfunctions in MATLAB has changed. Users should now use a greater-than sign '>' instead of a slash '/'. Awareness of such updates can save time when troubleshooting code.

It's like changing the way you ask for directions. If you used to say, 'Take a left on Main Street,' and now you need to say, 'Take a left at the light over the bridge,' you might get confused without practicing the new instruction.

5. Publishing - Publishing to LATEX now respects the image file type you specify in preferences rather than always using EPSC2-files. The Publish image options in Editor/Debugger preferences for Publishing Images have changed slightly. The changes prevent you from choosing invalid formats. The files created when publishing using cells now have more natural extensions. For example, JPEG-files now have a .jpg instead of a .jpeg extension, and EPSC2-files now have an .eps instead of an .epsc2 extension. Notebook will no longer support Microsoft Word 97 starting in the next release of MATLAB.

This point discusses enhancements to MATLAB's publishing features, which allow users to create documents easily from code and outputs. The updates ensure that images are saved in appropriate formats and that older software compatibility is being phased out, reflecting advancements in technology.

Consider using a new version of photo editing software that saves images in more modern formats. Just as old formats may not work with newer software, MATLAB is evolving to improve document presentation and usability for the users.

6. Debugging - Go directly to a subfunction or using the enhanced Go To dialog box. Click the Name column header to arrange the list of function alphabetically, or click the Line column header to arrange the list by the position of the functions in the file.

Enhancements to the debugging features in MATLAB allow for easier navigation within functions. Users can now sort their functions alphabetically or by their position in the code, which can significantly speed up the debugging process.

Imagine trying to find a book in a library; it would be much easier if all the books were organized either by title or by the author’s last name. Similarly, sorting functions in MATLAB can help programmers quickly locate and resolve issues in their code.

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