how to store a signal along with time in the same matrix?

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mahrukh jamil 2016-9-20

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评论： Star Strider 2016-9-25

Hello, I want to know how can i store and present two variables in a single matrix. i have a ECG data file of 1x100000 and a time vector of same size. i want to present them in the same matrix. how can i do that? Also can i add other variables too to the matrix like comments etc. Thank you

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Star Strider 2016-9-20

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在 MATLAB Online 中打开

Concatenate them vertically:

EKG_Record = [time; ECG];

This puts the time vector in row #1 and the electrocardiogram in row #2.

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Star Strider 2016-9-22

在 MATLAB Online 中打开

My pleasure.

Horizontal concatenation results from using no operator or the comma (,) operator between the variables. Vertical concatenation results from using the semicolon (;) operator. So for example if variables ‘a’, ‘b’ and ‘c’ are scalars:

v = [a b c];        % Row Vector
v = [a, b, c];      % Row Vector
v = [a; b; c];      % Column Vector

If you want to use the ‘EKG_Record’ variable in other applications as you created it here, save it as a .mat file.

Example:

save('EKG_Record_01.mat', 'EKG_Record')

then whenever you want to use it, load it as, for example:

d = load('EKG_Record_01.mat');

The ‘d’ variable now contains two fields, ‘time’ and ‘ECG’. To use them in your code, create new variables for them:

ECG1 = d.ECG;
t1   = d.time;

This allows you to assign them to specific variables so the variables in the .mat file do not overwrite variables of the same names already in your workspace. See the documentation for the save and load functions for a complete description.