Chapter 4: Programming in Matlab - College of the Redwoods

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312 Chapter 4 Programming in Matlab >> for k=A, k, end k = 1 3 k = 2 4 Note that k is assigned a column of matrix A at each iteration of the loop. This column assignment does not contradict the use we have already investigated, i.e., for k=start:increment:finish. In this case, the Matlab construct start:increment:finish creates a row vector and k is assigned a new column of the row vector at each iteration. Of course, this means that k is assigned a new element of the row vector at each iteration. As an example of use, let’s plot the family of functions defined by the equation y = 2Cte −t2 , (4.2) where C is one of a number of specific constants. The following code produces the family of curves shown in Figure 4.6. At each iteration of the loop, C is assigned the next value in the row vector [-5,-3,-1,0,1,3,5]. t=linspace(-4,4,200); for C=[-5,-3,-1,0,1,3,5] y=-2*C*t.*exp(-t.^2); line(t,y) end Break and Continue There are two sitautions that frequently occur when writing loops. 1. If a certain state is achieved, the programmer wishes to terminate the loop and pass control to the code that follows the end of the loop. 2. The programmer doesn’t want to exit the loop, but does want to pass control to the next iteration of the loop, thereby skipping any remaining code that remains in the loop. As an example of the first situation, consider the following snippet of code. Matlab’s break command will cause the loop to terminate if a prime is found in the loop index k.
Section 4.2 Control Structures in Matlab 313 Figure 4.6. A family of curves for C = −5, −3, −1, 0, 1, 3, and 5. for k=[4,8,12,15,17,19,21,24] if isprime(k) fprintf(’Prime found, %d, exiting loop.\n’,k) break end fprintf(’Current value of index k is: %d\n’,k) end Note that the output lists each value of k until a prime is found. The fprinft command issues a warning message and the break command terminates the loop. Current value of index k is: 4 Current value of index k is: 8 Current value of index k is: 12 Current value of index k is: 15 Prime found, 17, exiting loop. In this next code snippet, we want to print the multiples of three that are less than or equal to 20. At each iteration of the while loop, Matlab checks to see if k is divisible by 3. If not, it increments the counter k, then the continue statment
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4 Programming In Matlab In this cha
Page 3 and 4: Section 4.1 Logical Arrays 261 4.1
Page 5 and 6: Section 4.1 Logical Arrays 263 >> A
Page 7 and 8: Section 4.1 Logical Arrays 265 >> u
Page 9 and 10: Section 4.1 Logical Arrays 267 A nu
Page 11 and 12: Section 4.1 Logical Arrays 269 Seem
Page 13 and 14: Section 4.1 Logical Arrays 271 >> k
Page 15 and 16: Section 4.1 Logical Arrays 273 >> a
Page 17 and 18: Section 4.1 Logical Arrays 275 >> x
Page 19 and 20: Section 4.1 Logical Arrays 277 >> m
Page 25 and 26: Section 4.1 Logical Arrays 283 That
Page 29 and 30: Section 4.1 Logical Arrays 287 prim
Page 33 and 34: Section 4.1 Logical Arrays 291 x=li
Page 35 and 36: Section 4.1 Logical Arrays 293 29.
Page 37 and 38: Section 4.1 Logical Arrays 295 Elim
Page 39 and 40: Section 4.1 Logical Arrays 297 Draw
Page 41 and 42: Section 4.2 Control Structures in M
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Page 75 and 76: Section 4.3 Functions in Matlab 333
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Section 4.4 Variable Scope in Matla
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Chapter 4: Programming in Matlab - College of the Redwoods

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