code with variables changes
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Hi all
I have to write code for the following
Y_k = Ax_k + b
Z_k= Y_k +C
Now for K from 0 -200 the A = 2 and b=3,C =2
for K from 201- 400 the A = 4 and b=5, C=2
what code I can write to Specify these conditions? I mean chang in K, change the parameters values.
采纳的回答
Walter Roberson
2019-5-30
If you have the Symbolic Toolbox, the easiest way can be to use piecewise()
Otherwise:
A = @(k) (k >= 0 & k<=200) .* 2*ones(size(k)) + (k>200 & k<=400) .* 4*ones(size(k));
b = @(k) (k >= 0 & k<=200) .* 3*ones(size(k)) + (k>200 & k<=400) .* 5*ones(size(k));
C = @(k) (k >= 0 & k<=400) .* 2*ones(size(k));
Y = @(k) A(k) + b(k);
Z = @(k) Y(k) + C(k);
fplot(Z, [-20 420])
4 个评论
Lina Alhelo
2019-5-30
Walter Roberson
2019-5-30
I thought Ax_k was all one variable name.
If you have an x_k but no formula for x_k then that implies that k is acting as a subscript. That is not impossible to deal with, but since k can be 0 then it implies that 0 is a valid subscript, which is not the case in MATLAB.
Y = @(k) A(k).*x(k) + b(k);
Z = @(k) Y(k) + C(k);
k = 1:numel(x);
plot(k, Z(k))
Lina Alhelo
2019-5-30
Walter Roberson
2019-5-30
Then the code I gave should work.
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