MATLAB POLYSPACE RELEASE NOTES Manuale Utente Pagina 33
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Expressions
Expressions
In this section.. .
“Variables” on page 2-11
“Numbers” on page 2-12
“Operators” on page 2-12
“Functions” on page 2-13
“Examples of Expressions” on page 2-14
Variables
Like most other programming languages, MATLAB provides mathematical
expressions, b ut unlike most programming languages, these expressions
involve entire matrices.
MATLAB does not require any type declarations or dimension statements.
When MATLAB encounters a new variable name, it automatically creates the
variable and allocates the a ppropriate amount of storage. If the variable
already exists, MATLAB changes its contents and, if necessary, allocates
new storage. For example,
num_students = 25
creates a 1-by-1 matrix n
amed
num_students and stores the value 25 in its
single element. To view
the matrix assigned to any variable, simply enter
the variable name.
Variable name s co nsist
of a letter, followed by any number of letters, digits, or
underscores. MATLAB i
s case sensitive; it distinguishes between uppercase
and lowercase letters
.
A and a are not the same variable.
Although variable nam
es can be of any length, M ATLAB uses o nly the first
N characters of the nam
e, (where
N is the number returned by the func tion
namelengthmax), and i
gnores the rest. Hence, it is important to make
each variable name un
ique in the first
N characters to enable MATLAB to
distinguish variabl
es.
N = namelengthmax
2-11
- Getting Started withMATLAB 1
- 508-647-7000 (Phone) 2
- 508-647-7001 (Fax) 2
- The MathWorks, I nc 2
- 3 Apple Hill Drive 2
- Natick, MA 01760-2098 2
- Revision History 3
- External Interfaces 10
- .................. 8-4 11
- Contents 12
- Introduction 13
- What Is MATLAB? 14
- The M ATLAB System 15
- 1 Introduction 16
- MATLAB Documentation 17
- Star ting and Quitting MATLAB 19
- Confirm Quitting 21
- Matrices and Arrays 23
- Matrices a nd Magic Squares 24
- Matrices and Mag ic Squares 25
- ; ,toindicatetheendofeachrow 26
- 2 Matrices and Arra ys 28
- Subscripts 29
- The magic Function 31
- Expressions 33
- Functions 35
- Working with Matrices 38
- The load Function 39
- Deleting Rows an 41
- Scalar Expansio 49
- Logical Subscrip 49
- Suppressing Output 53
- Graphics 57
- Over view of MATLAB Plotting 58
- Exploring Data 59
- Editing the Graph Components 59
- Annotating Graphs 59
- CLF in the 60
- Graph Components 61
- Overview of MATLAB Plotting 63
- Enable plotting tools from 65
- Plot edit mode enabled 73
- Editing Plots 75
- + to the left o f 77
- Set line to no line 83
- Set Marker to O 83
- Set Marker fill color to red 83
- Set Marker size to 4.0 83
- 1. Select axes 85
- Select both sets of data 87
- Select Stem as the Plot Type 87
- 3 Click th 89
- XData and YData are 91
- 3 Graphics 100
- Set the size at which to 103
- Fonts in the Export 103
- 8 in the text box 103
- Creating a Plot 105
- Figure Windows 111
- [X,Y,Z] = cylinder(4*cos(t)); 113
- Adding Axis Labels and Titles 115
- Saving Figures 117
- AboutMeshandSurfacePlots 119
- Making Surfaces Transparent 121
- Manipulating the Surface 123
- Plotting Image Data 125
- Printing Graphics 127
- Printing Grap hics 129
- Handle Graphics 130
- Graphics Objects 131
- Setting Object Properties 133
- Programming 139
- Flow Control 140
- 4 Programming 142
- Error Control – try, catch 145
- Other Data Structures 147
- Cell Arrays 149
- Characters and Text 151
- Scripts and Functions 158
- Private Functions 163
- Nested Functions 163
- Function Functions 167
- Vectorization 169
- Data Analysis 171
- Preprocessing Data 173
- 5 Data Analysis 174
- Summarizing Data 180
- Measures of Scale 181
- Shape of a Distr ibution 181
- Visualizing Data 184
- Modeling Data 189
- Creating Graphical User 195
- Interfaces 195
- What Is GUIDE? 196
- Laying Out a GUI 197
- Component 198
- Layout Area 198
- Programming a GUI 200
- Desktop Tools and 201
- Development Environment 201
- Desktop Overview 202
- Desktop Over view 203
- Arranging the Desktop 204
- Start Button 204
- Command Window 206
- Command History 207
- Help Browser 208
- "word1 word2" 210
- Other Forms of Help 211
- Ty pographical Conventions 212
- ...) ellipsis denotes 213
- [c, ia, ib] = 213
- Running Files 214
- Current Directory 214
- Search Path 215
- Workspace Browser 217
- Array Editor 218
- Editor/Debugger 220
- Directory reports 223
- Profiler 226
- Programming Interfaces 230
- Call Java from MATLAB 231
- Import and Export Data 231
- 8 External Interfaces 232
- Web Services 233
- Serial Port Interface 234
- Index: operator 2-8 235
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