Sta113: Lab1 (Friday, January 10, 2003)

Starting Matlab

Log onto the acpub unix workstation
Start Matlab by typing
```
 matlab 
```
Input commands to Matlab from its screen interactively and execute Matlab commands simply by typing them in, followed by Enter
```
 
>> 3+2
ans =
     5
```
You can suppress output to the screen by adding a semicolon after the statement
```
>> 3+2;
```

Draw bar graph for Diamond Thin Film data from Exercise 2.8

% input data
papers = [105, 63, 20, 17, 7, 39];
country = {'United States', 'Japan', 'United Kingdom',
               'Germany', 'Italy', 'Others'};
total = sum(papers);

% draw bar graph (vertical)
bar(papers)
ylabel('Number of Papers on Diamond Thin Film Research');
title('Frequency Bar Graph for Diamond Thin Film Data');

% "gca" gets the handle for the current axes
set(gca, 'XTickLabel', country);

% draw relative frequency bar graph (horizontal)
barh(papers./total)
set(gca, 'YTickLabel', country);
xlabel('Relative Frequency of Papers on Diamond Thin Film Research');
title('Relative Frequency Bar Graph for Diamond Thin Film Data');

% draw Pareto diagram
[newpapers, index] = sort(papers);
bar(newpapers)
set(gca, 'XTickLabel', country(index));
ylabel('Number of Papers on Diamond Thin Film Research');
title('Frequency Bar Graph for Diamond Thin Film Data');

Getting Help

Nicer, windowed help system
```
 >> helpwin  
```
You can virtually be on yourself once you know how to get help.

Two other ways to find help

>> lookfor key_words
>> help command_name

Print Graphics

Directly print from Graphics window : Graphics window > File > Print
Export graph to files (.eps) and then view them from your working directory: "ghostview mygraph.ps &"

Leaving Matlab

```
 
>> save mywork.mat
>> exit 
```
You can find you have a new file called "mywork.mat" in your current directory. Next time when you start matlab at the same directory, you can restore all your results by typing
```
 >> load mywork.mat
```