MATLAB: How to work on a valuable name with a minus sign in it…

valuable name with a operator

Hello,

Could you please help me to change a valuable name with a minus sign in it?

the valuable name is something like

"data.a-b"

Thus, when I try to call the valuable in the command prompt,

matlab recognizes as the following

data.a – b (i.e., data.a minus b, instead of a single valuable.)

Best Answer

From this documentation:

https://mathworks.com/help/matlab/matlab_prog/variable-names.html

"valid variable name starts with a letter, followed by letters, digits, or underscores"

You cannot include the " - " symbol in a matlab variable name.

If you want to define a variable that corresponds to " a - b", you can call it "a_minus_b".

Related Solutions

MATLAB: How to assign A or B or C to a Variable

Assuming you already have a variable called RSxi, to rename it, you simply assign it to a new variable with your desired new name. Then you can clear the old variable if you want:

% Rename RSxi to RSai
RSai = RSxi;
clear('RSxi'); % If you want to get rid of old variable, clear it.

% Rename RSai to RSbi
RSbi = RSai;
clear('RSai'); % If you want to get rid of old variable, clear it.

MATLAB: Extract valuable data from signal

Try something like this, where I take the absolute value, then filter it to get rid of the oscillating parts, then take the difference, and finally extract the 5 bursts:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Generate sample data.
signal = 0.003 * rand(1, 550) - 0.0015
signal(50:100) = 0.03 * rand(1, 51) - 0.015
signal(150:200) = 0.03 * rand(1, 51) - 0.015
signal(250:300) = 0.03 * rand(1, 51) - 0.015
signal(350:400) = 0.03 * rand(1, 51) - 0.015
signal(450:500) = 0.03 * rand(1, 51) - 0.015
subplot(3, 1, 1);
plot(signal);
title('Original Signal', 'FontSize', fontSize);
grid on;
% Enlarge figure to full screen.

set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Take absolute value and median filter to get rid of oscillations.
filteredSignal = medfilt1(abs(signal), 13);
subplot(3, 1, 2);
plot(filteredSignal);
title('Filtered Signal', 'FontSize', fontSize);
% Find the quiet parts between the bursts.
quietParts = filteredSignal < 0.002;
subplot(3, 1, 3);
plot(quietParts, 'LineWidth', 3);
ylim([0 1.2]);
title('Quiet Parts', 'FontSize', fontSize);
% Find the starting and ending elements of the bursts.
startingBlockIndexes = find(diff(quietParts) < 0)
endingBlockIndexes = find(diff(quietParts) > 0)
% Extract the 5 blocks (known to be exactly 5)
v1 = signal(startingBlockIndexes(1):endingBlockIndexes(1));
v2 = signal(startingBlockIndexes(2):endingBlockIndexes(2));
v3 = signal(startingBlockIndexes(3):endingBlockIndexes(3));
v4 = signal(startingBlockIndexes(4):endingBlockIndexes(4));
v5 = signal(startingBlockIndexes(5):endingBlockIndexes(5));
% Plot the 5 signals.
figure;
subplot(5, 1, 1);
plot(v1);
grid on;
title('V1', 'FontSize', fontSize);
subplot(5, 1, 2);
plot(v2);
grid on;
title('V2', 'FontSize', fontSize);
subplot(5, 1, 3);
plot(v3);
grid on;
title('V3', 'FontSize', fontSize);
subplot(5, 1, 4);
plot(v4);
grid on;
title('V4', 'FontSize', fontSize);
subplot(5, 1, 5);
plot(v5);
grid on;
title('V5', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);

Best Answer

Related Solutions

MATLAB: How to assign A or B or C to a Variable

MATLAB: Extract valuable data from signal

Related Question