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Calculate all slopes of arrays in a cell

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Anni Shi
Anni Shi 2022-8-15
回答： Image Analyst 2022-8-16
Hello,
I generated a cell structure with 6 2100*4 arrays.
I want to calculate the slope of the first(x) and the second column (y) of each array in the cell.
Is there any way to operate individual element in a cell and return the list of outputs?
Thank you?
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Anni Shi
Anni Shi 2022-8-15
Data file is attached. Thank you for the reminder!

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Image Analyst
Image Analyst 2022-8-16
Try this:
% Demo by Image Analyst
% Initialization Steps.
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 long g;
format compact;
fontSize = 18;
s = load('test_data.mat')
Allmsd = s.Allmsd
[rows, columns] = size(Allmsd)
slopes = zeros(rows, 1);
subplot(2, 1, 1);
for k=1:numel(Allmsd)
thisArray = Allmsd{k};
x = thisArray(:, 1);
y = thisArray(:, 2);
% Get rid of nans.
badIndexes = isnan(x) | isnan(y);
x(badIndexes) = [];
y(badIndexes) = [];
plot(x, y, '-', 'LineWidth', 2);
grid on;
hold on;
coefficients = polyfit(x, y, 1)
slopes(k) = coefficients(1)
end
legend
title('Individual Curves', 'FontSize', fontSize)
% Plot slopes
subplot(2, 1, 2);
bar(slopes)
grid on;
title('Slopes', 'FontSize', fontSize)

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