MATLAB: Code with variables changes

loop

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.

Best Answer

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])

Related Solutions

MATLAB: Stuck using For-loops

use count000 = zeros(5,1); which declares a vector of 5 elements initialized at 0. Now, you can loop:

    for i=1:5
    count000(i) = blablabla...
    end
And make sure that xyz_values(:,2) is also a vector, by declaring xyz_values to be a 3dimensional matrix instead of 2D.

Even better, now you can keep only one variable for all count000, count025, etc... by using

count = zeros(5,22);
for i=1:5
for j=1:22
count(i,j) = blablabla... >= (j-1)*0.025  blablabla....
end
bar(i,:)
end

The (j-1)*0.025 gives you 0.00, 0.025, 0.050 etc as appropriate. By using two loops, you can reduce the size of the code pretty much :)

MATLAB: Array indices must be positive integers or logical values error , for the t(i) ,why

You initialize t=0 and i=0 . You store into some arrays indexed at (i+1), which is valid because 0+1 = 1 is a valid subscript. But then you get to b=t(i) and i is still 0 so you are trying to index t at location 0.

Best Answer

Related Solutions

MATLAB: Stuck using For-loops

MATLAB: Array indices must be positive integers or logical values error , for the t(i) ,why

Related Question