time series fatigue test

Good day everyone,

excuse me but i am very new to matlab..

I am generating a time series, to perform a fatigue test.

Answer 1

[Daniel M]

You can follow this example:

lb = 5; % lower bound, ymin
ub = 10; % upper bound
N = 1000; % num samples
vals = rand(1,N).*(ub-lb) + lb;

Answer 2

[Akira Agata]

How about the following?

N = [1000 , 500 , 2000 , 300 , 700 , 1000];   % No of samples
NI = length(N);
y_min = 10 + (60-10)*rand(1,NI); % Random between 10 and 60
y_max = zeros(size(y_min));
for kk = 1:NI % Create y_max which is random num between max(y_min(kk), 15) and 75
    if y_min(kk) < 15
        y_max(kk) = 15 + (75-15)*rand;
    else
        y_max(kk) = y_min(kk) + (75-y_min(kk))*rand;
    end
end

Y = zeros(1,sum(N));
T = 1:sum(N);
Ncs = [0, cumsum(N)];
for kk = 1:NI
    Y(Ncs(kk)+1:Ncs(kk+1)) = y_min(kk) + (y_max(kk)-y_min(kk))*rand(1,N(kk));
end

figure
plot(T,Y,'k')
grid on
box on

[Akira Agata]

To generate random integer number, please try randi function.