How to adjust data?

Question

Kacper Suchecki 2021-1-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/719400-how-to-adjust-data

评论： Star Strider 2021-1-20

Hi,

I need help. I had get data of signal but it doesnt seems good. I want to have straight signal with limit 200 on below and up to 1100 on the top, by only adjusting him not cuting.

I tried something like this .

for x 1:5000005
if x<40000
    wspolrzedna(x)=wspolrzedna(x)-100;
end
if x<100000 & x>40000
    wspolrzedna(x)=wspolrzedna(x)+200;
end
if x<300000 & x>100000
    wspolrzedna(x)=wspolrzedna(x)+300;
end
if x<500000 & x>300000
    wspolrzedna(x)=wspolrzedna(x)+500;
end
if x<750000 & x>500000
    wspolrzedna(x)=wspolrzedna(x)+750;
end
if x<1000000 & x>750000
    wspolrzedna(x)=wspolrzedna(x)+1000;
end
end

I get only something like this. I please for help. Thanks. (The plots plots are built in time scale , the code was write using samples. I have 5000005 samples which i want adjust )

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Answer 1

Star Strider 2021-1-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/719400-how-to-adjust-data#answer_599915

在 MATLAB Online 中打开

It would be easiest to use the detrend function:

t = linspace(0, 100, 1E+4);                         % Create Data
s = sin(2*pi*t) + 0.001*(t-50).^2;                  % Create Data
figure
plot(t,s)
grid
s_det = detrend(s, 3);                              % Detrend Using 3° Polynomial
figure
plot(t, s_det)
grid