MATLAB: Extracting from a matrix

matrix

I have a 6 row 800 column matrix… How do I extract the data in row 2 only to the 600th column?

Best Answer

Where A is your matrix:

B = A(2,1:600)

Basic MATLAB concepts, like how to use indexing, are explained in the introductory tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

Related Solutions

MATLAB: Having issues with plotting

clear,clc
load('DATA_01_TYPE01.mat')
A = sig;
x = A(2,1:1000)
t= 0:200:1000;
subplot(3,1,1)
plot(t,x)

for plot, length of x and y must be same. You try

length(t)
length(x)

then you will notice they are different, x has 1:1000 which is 1000 elements, but t=0:200:1000, only have 5 elements.

if you try code below, you will get the plot without error

clear,clc
load('DATA_01_TYPE01.mat')
A = sig;
x = A(2,1:1000)
t=1:1:1000;
subplot(3,1,1)
plot(t,x)

because now both t and x have the same length which is 1000.

MATLAB: Not enough input arguments

Read the documentation. The ss2sos help clearly lists all of the syntaxes that it supports, and none of them have only two input arguments: the smallest number of input arguments is four state-space matrices.

The MATLAB help even has examples, so you do not need to guess how to use functions:

[A,B,C,D] = butter(5,0.2);
sos = ss2sos(A,B,C,D)

From that you can quickly figure out that you need to get butter to return the four state-space matrices, not just the two transfer coefficients as you are doing.

Best Answer

Related Solutions

MATLAB: Having issues with plotting

MATLAB: Not enough input arguments

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