Dynamic changing values
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Hello, I have a question about dynamic changing values.
A list of values (or maybe vectors or maybe matrices): a, b, c, d, e, f, ... ...
There are equations between a, b, c, and d, e, f
---------------
*a* , b, c,
---------------
*d*, e, f ....
---------------
a = x1*b + x2 * c
d = x1*e + x2 * f
values *a* depends on value b and c
values *d* depends on value e and f
x1, x2 are two constant,
And b, c, e, f are variables, their values keep updating in a loop. How to update a, d's values dynamically once b, c, e, f are changed?
I see matlab has no pointer like C, C++. Can matlab do changing values dynamically?
Thanks in advance for your help!
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采纳的回答
Walter Roberson
2011-3-8
If you have access to the symbolic toolbox, then you can define your values symbolically, and then when you need a particular numeric value, subs() the current values of the independent variables and double() the result of subs() to get the double precision representation of the resulting symbolic number.
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更多回答(2 个)
Jiro Doke
2011-3-8
Just redefine a and d after you update the other values:
for id = 1:100
a = x1*b + x2 * c
d = x1*e + x2 * f
...
<do your stuff>
...
<update b, c, e, f>
end
3 个评论
Jiro Doke
2011-3-8
Well, I guess I don't fully understand your question. In my above example, every time through the loop, a and d are updated with the new set of values for b, c, e, f. Can you explain why this doesn't work?
Daniel Shub
2011-3-8
Seems like this might be related to the polynomial class example included in the OOP guide
web([docroot '/techdoc/matlab_oop/f3-39071.html'])
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