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  1. function energy()
  2.     % Clears command window, closes all figures, and clears workspace
  3.     clc;
  4.     close all;
  5.     clear;
  6.  
  7.     % Define the speed of light (c) in m/s
  8.     c = 2.9979e8; 
  9.  
  10.     % Input: Mass vector from user
  11.     m = input('Enter a vector of masses in kg: ');
  12.  
  13.     % Ensure the input is a valid numeric vector
  14.     if ~isnumeric(m) || isempty(m)
  15.         error('Input must be a numeric vector.');
  16.     end
  17.  
  18.     % Compute energy values using E = mc^2
  19.     E = m .* (c^2);
  20.  
  21.     % Display results
  22.     disp('Mass (kg)      Energy (J)');
  23.     disp([m(:), E(:)]);
  24.  
  25.     % Save results to an Excel file
  26.     filename = 'Energy_Data.xlsx';
  27.     data = [m(:), E(:)];
  28.     headers = {'Mass (kg)', 'Energy (J)'};
  29.  
  30.     % Write headers and data to an Excel file
  31.     writematrix(headers, filename, 'Sheet', 1, 'Range', 'A1');
  32.     writematrix(data, filename, 'Sheet', 1, 'Range', 'A2');
  33.  
  34.     % Plot energy vs mass (Standard plot)
  35.     figure(1);
  36.     plot(m, E, 'bo-', 'LineWidth', 2);
  37.     xlabel('Mass (kg)');
  38.     ylabel('Energy (J)');
  39.     title('Energy vs Mass (Standard Plot)');
  40.     grid on;
  41.  
  42.     % Logarithmic plots in a single figure using subplots
  43.     figure(2);
  44.  
  45.     subplot(2,2,1);
  46.     semilogx(m, E, 'r*-');
  47.     xlabel('Mass (kg)');
  48.     ylabel('Energy (J)');
  49.     title('Semilogx: Log Scale on X-axis');
  50.     grid on;
  51.  
  52.     subplot(2,2,2);
  53.     semilogy(m, E, 'g*-');
  54.     xlabel('Mass (kg)');
  55.     ylabel('Energy (J)');
  56.     title('Semilogy: Log Scale on Y-axis');
  57.     grid on;
  58.  
  59.     subplot(2,2,3);
  60.     loglog(m, E, 'm*-');
  61.     xlabel('Mass (kg)');
  62.     ylabel('Energy (J)');
  63.     title('Loglog: Log Scale on Both Axes');
  64.     grid on;
  65.  
  66.     % Adjust subplot layout for better visualization
  67.     subplot(2,2,4);
  68.     text(0.1, 0.5, 'Logarithmic Analysis of Energy vs Mass', 'FontSize', 12, 'FontWeight', 'bold');
  69.     axis off;
  70.  
  71.     % Notify user about file storage
  72.     fprintf('Energy values have been saved to %s\n', filename);
  73.  
  74.     % Sample Output
  75.     fprintf('\nSample Output:\n');
  76.     fprintf('Enter a vector of masses in kg: [1 5 10 50 100]\n');
  77.     fprintf('\nMass (kg)      Energy (J)\n');
  78.     sample_m = [1 5 10 50 100];
  79.     sample_E = sample_m .* (c^2);
  80.     fprintf('%-12.4f %-12.4e\n', [sample_m; sample_E]);
  81.     fprintf('\nEnergy values have been saved to Energy_Data.xlsx\n');
  82. end
  83.  
Success #stdin #stdout 0.1s 46988KB
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https://ideone.com/mDDmMm
language:
Octave (octave 4.4.1)
created:
10 days ago
visibility:
public

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