Chapter 4: Programming in Matlab - College of the Redwoods

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370 Chapter 4 Programming in Matlab When the persistent variable is first declared, it is set to the empty matrix. On the first call of the function, we need a different reaction than on ensuing function calls. If the variable SUM_T is empty, we initialize it to zero. On the next call of the function, the variable SUM_T is no longer empty, so it is updated by incrementing SUM_T by term. To get a sense of how this function will perform, we intentionally left off a suppressing semicolon in the command SUM_T=SUM_T+term so that we can track progress of the persistent variable between repeated function calls. Enter the following command at the Matlab prompt in the command window. >> for k=1:5,addTerm(1/k),end SUM_T = 1 SUM_T = 1.5000 SUM_T = 1.8333 SUM_T = 2.0833 SUM_T = 2.2833 Although the above should clearly demonstrate that SUM_T retains its value between successive function calls, another run of the loop should cement the idea of a persistent variable firmly in our minds. >> for k=1:5,addTerm(1/k),end SUM_T = 3.2833 SUM_T = 3.7833 SUM_T = 4.1167 SUM_T = 4.3667 SUM_T = 4.5667 Readers should carefully check (with calculator in hand) that these values are correct.
Section 4.4 Variable Scope in Matlab 371 To clear a persistent variable from memory, you can use either clear the function from memory clear addTerm or you can use the command clear all.
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4 Programming In Matlab In this cha
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Section 4.1 Logical Arrays 261 4.1
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Section 4.1 Logical Arrays 263 >> A
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Section 4.1 Logical Arrays 265 >> u
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Section 4.1 Logical Arrays 267 A nu
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Section 4.1 Logical Arrays 269 Seem
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Section 4.1 Logical Arrays 271 >> k
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Section 4.1 Logical Arrays 283 That
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Section 4.1 Logical Arrays 287 prim
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Section 4.1 Logical Arrays 291 x=li
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Section 4.1 Logical Arrays 295 Elim
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Section 4.2 Control Structures in M
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