Discussion - Revision history

Rb: /* Creating and executing script m-files */

2013-10-10T13:16:52Z

‎Creating and executing script m-files

Rb: /* Some basic MATLAB commands */

2013-10-08T12:20:35Z

‎Some basic MATLAB commands

Rb: /* Some basic MATLAB functions for matrices */

2013-10-08T12:16:25Z

‎Some basic MATLAB functions for matrices

Rb: /* Creating and executing script m-files */

2013-10-08T12:08:01Z

‎Creating and executing script m-files

Test at 19:52, 26 October 2012

2012-10-26T19:52:44Z

Test at 19:52, 26 October 2012

2012-10-26T19:52:29Z

Admin: /* Creating and executing script m-files */

2012-10-23T13:50:34Z

‎Creating and executing script m-files

Admin: /* Programming in MATLAB */

2012-10-01T10:34:23Z

‎Programming in MATLAB

Admin: /* Programming in MATLAB */

2012-10-01T10:21:32Z

‎Programming in MATLAB

Admin: /* Programming in MATLAB */

2012-10-01T10:19:58Z

‎Programming in MATLAB

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 You can use MATLAB to perform individual operations by just typing them into the command window (Window C). However, the strength of MATLAB lies in collecting a whole bunch of commands and then executing them in one go. Such a bunch of commands is usually written into an m–file.
-An m–file can be created using the MATLAB Editor. To do this, click on <source enclose=none>File</source> at the top of the MATLAB window and then select <source enclose=none>New</source> followed by m–file. You will then be in the editor. Enter the commands:
+An m–file can be created using the MATLAB Editor. To do this, click on <source enclose=none>File</source> at the top of the MATLAB window and then select <source enclose=none>New</source> and then <source enclose=none>Script</source> which creates a new file with extension m. You will then be in the editor. Enter the commands:
 <source>C = [5 4; 3 2]; % Create 2x2 matrix

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      \,\right]</math></p>
 <p>Elements in one row are seperated by a space (although you could also use a <source enclose=none>,</source> and a <source enclose=none>;</source> indicates that the next element is the first element in a new row.</p></li>
 <li><p><source enclose=none>b = A(2,3)</source>, this saves the element from the 2nd row and 3rd columns of A in the new variable b.</p></li>
 <li><p><source enclose=none>c = 1:5</source>, creates a <math>(1\times5)</math> row vector with the numbers 1 to 5</p></li>

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 In a later module you can read about functions in MATLAB. But in short they are little pieces of code that perform some pre-specified operations. In the context of matrices you may have some painful memories of having to calculate the inverse of a matrix by hand. Wouldn’t it be nice if MATLAB could do this with one little command. Well you are in luck, MATLAB can. The inverse of the matrix A can be calculated by using <source enclose=none>inv(A)</source>.
-Well, this is only a half truth. MATLAB will still have to do all the painstaking operations required for the calculation of a matrix inverse, but it will do this all by itself and in the background as one clever programmer wrote a little piece of software that you call up, by typing <source enclose=none>inv(A)</source>. Such a piece of software is called MATLAB. In a later module you can learn how to write such functions yourself. In fact it is very likely that you will wan to do this to make your life easier.
+Well, this is only a half truth. MATLAB will still have to do all the painstaking operations required for the calculation of a matrix inverse, but it will do this all by itself and in the background as one clever programmer wrote a little piece of software that you call up, by typing <source enclose=none>inv(A)</source>. Such a piece of software is called MATLAB. In a later module you can learn how to write such functions yourself. In fact it is very likely that you will want to do this to make your life easier.
 Here is a list of useful matrix functions in MATLAB:

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 To execute this program type test1 on the command line in the MATLAB Command window and then hit enter<ref>For this to work, the current folder (see the field just underneath the menus needs to be set to the folder in which you saved this m file
-</ref>. You can then seen that test1.m causes <source enclose=none>det(C)</source> to be printed into the command window. At this stage you will also see two objects in the workspace (Window D), namely <source enclose=none>C</source> and <source enclose=none>dc</source>. You can use them in new calculations in the command window, say type<br />
+</ref>. You can then see that test1.m causes <source enclose=none>det(C)</source> to be printed into the command window. At this stage you will also see two objects in the workspace (Window D), namely <source enclose=none>C</source> and <source enclose=none>dc</source>. You can use them in new calculations in the command window, say type<br />
 <source enclose=none>2*dc</source> and the ENTER.<br />

← Older revision		Revision as of 19:52, 26 October 2012
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	= Programming in MATLAB =		= Programming in MATLAB =
−	1	+
	We now consider how to create, edit and execute m–files. But initially we will have a brief look at the MATLAB screen.		We now consider how to create, edit and execute m–files. But initially we will have a brief look at the MATLAB screen.

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 Everything following a % are comments and are ignired by MATLAB. It is good practice to use a lot of comments.
-Now save the program into a file called test1.m. For now you created a collection of commands (three to be precise). What you now want is to tell MATLAB that you want it to execute these commands (of course you will typically have many more than three commands).
+Now save the program into a file called test1.m. The name of a script file should start with a letter and must NOT include spaces. For now you created a collection of commands (three to be precise). What you now want is to tell MATLAB that you want it to execute these commands (of course you will typically have many more than three commands).
 To execute this program type test1 on the command line in the MATLAB Command window and then hit enter<ref>For this to work, the current folder (see the field just underneath the menus needs to be set to the folder in which you saved this m file

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 We now consider how to create, edit and execute m–files. But initially we will have a brief look at the MATLAB screen.
-[[File:MATLABscreen.jpg|frameless|300px]]
+[[File:MATLABscreen.jpg|frameless|500px]]
 This is how MATLAB looks on my machine although it may be arranged slightly differently on yours. However the 4 main elements A to D will always be there and I will briefly explain them