Shadow File IO for Matlab

Introduction

Matlab module to read a Shadow take.

Quick Start

A really quick start.

% Find your most recent take and plot all of the data at once
plot(shadow.takeread());

OK, that was too much. Pick one channel at random.

% Read back the data stream and the header so we can show the time axis for
% one randomly selected channel
[A, header] = shadow.takeread();

% Number of samples, one per row
n = size(A, 1);

% Create a time axis in seconds
x = [0:n-1] * header.h;

% Select a channel, one column
y = A(:, randi(n));

% Plot one channel over time
plot(x, y);

Great! Now pick a particular measurement and make a better report.

% Pick the gyroscope channel from the Hips node and create a nicer plot
[A, header] = shadow.takeread();

% Node key 5 is the Hips in Shadow full body take
key = 5;
name = shadow.header.name();

% Find the gyroscope measurement channel
g_range = shadow.header.range(header, key, name.g);
if isempty(g_range)
  error('no gyroscope measurement for the Hips node');
end

% Number of samples, one per row
n = size(A, 1);

% Create a time axis in seconds
x = [0:n-1] * header.h;

% Plot gyroscope data, x-y-z order in deg/s
plot(x, A(:, g_range));
title('Gyroscope measurements for Hips');
xlabel('Time (s)');
ylabel('Angular rate (deg/s)');
legend('Hips.gx', 'Hips.gy', 'Hips.gz');

License

This project is distributed under a permissive BSD License.