Not able to see where the index is going past 5

3 次查看（过去 30 天）
Sebastian
Sebastian 2024-9-17
评论： Cris LaPierre 2024-9-18
load('Motor_Data.mat');
fprintf('Available motors:\n');
for i = 1:length(Names)
fprintf('%d: %s\n', i, Names(i));
end
motor_index = input('Select a motor by entering its number: ');
mass = input('Enter the mass to be lifted (in kg): ');
height = input('Enter the height to lift the mass (in meters): ');
%Says this is where it errors
motor_name = Names(motor_index); %HERE
power = Specs(1, motor_index);
efficiency = Specs(2, motor_index);
% Calculate output power
efficiency_decimal = efficiency / 100;
output_power = efficiency_decimal * power;
g = 9.81;
energy_required = mass * g * height;
time = energy_required / output_power;
fprintf('Motor: %s\n', motor_name);
fprintf('Load lifted: %.2f kg\n', mass);
fprintf('Height lifted: %.2f meters\n', height);
fprintf('Time to lift the load: %.2f seconds\n', time);
%Task 2
mass = input('Enter the mass to be lifted by all motors (in kg): ');
height = input('Enter the height to lift the mass by all motors (in meters): ');
% Initialize results matrix
num_motors = length(Names);
results = zeros(5, num_motors);
% Calculate time for each motor
g = 9.81; % Gravity constant
for i = 1:num_motors
power = Specs(1, i); % Power in watts
efficiency = Specs(2, i); % Efficiency in percentage
efficiency_decimal = efficiency / 100;
output_power = efficiency_decimal * power;
% Energy required to lift mass
energy_required = mass * g * height;
% Time to lift
time = energy_required / output_power;
% Store results: power, efficiency, mass, height, time
results(:, i) = [power; efficiency; mass; height; time];
end
% Export results to CSV file
csvwrite('Task2_Results.csv', results);
% Display the matrix to verify
disp('Results matrix:');
disp(results);
%Task 3
output_powers = Specs(1, :) .* (Specs(2, :) / 100); % Output power for each motor
times = results(5, :); % Time from the results matrix
scatter(output_powers, times, 'filled');
xlabel('Output Power (W)');
ylabel('Time to Lift Load (s)');
title('Motor Output Power vs. Time to Lift Load');
grid on;
  13 个评论
显示 11更早的评论
Sebastian
Sebastian 2024-9-17
This is just the prompt. The matlab code grader is through the Canvas software
Cris LaPierre
Cris LaPierre 2024-9-18
The prompt is helpful, but it would also be helpful to see the assessment page as well.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Image Analyst
Image Analyst 2024-9-17
Names only has 4 strings in it, not 5 so that's why you get the error. The code is not very robust. Here, I've improved it by giving a better error message if the user enters the wrong number (see the while loop). It works for me in desktop MATLAB.
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 short g;
format compact;
load('Motor_Data.mat');
motor_index = inf; % Initialize.
while motor_index >= numel(Names) || motor_index < 1
fprintf('Available motors:\n');
for k = 1:length(Names)
fprintf('%d: %s\n', k, Names(k));
end
motor_index = input('Select a motor by entering its number: ');
if motor_index > numel(Names) || motor_index < 1
beep;
fprintf('NO SUCH MOTOR NUMBER! Enter a number between 1 and %d.\n', numel(Names));
end
end
mass = input('Enter the mass to be lifted (in kg): ');
height = input('Enter the height to lift the mass (in meters): ');
motor_name = Names(motor_index);
power = Specs(1, motor_index);
efficiency = Specs(2, motor_index);
% Calculate output power
efficiency_decimal = efficiency / 100;
output_power = efficiency_decimal * power;
g = 9.81;
energy_required = mass * g * height;
time = energy_required / output_power;
fprintf('Motor: %s\n', motor_name);
fprintf('Load lifted: %.2f kg\n', mass);
fprintf('Height lifted: %.2f meters\n', height);
fprintf('Time to lift the load: %.2f seconds\n', time);
%Task 2
mass = input('Enter the mass to be lifted by all motors (in kg): ');
height = input('Enter the height to lift the mass by all motors (in meters): ');
% Initialize results matrix
num_motors = length(Names);
results = zeros(5, num_motors);
% Calculate time for each motor
g = 9.81; % Gravity constant
for k = 1:num_motors
power = Specs(1, k); % Power in watts
efficiency = Specs(2, k); % Efficiency in percentage
efficiency_decimal = efficiency / 100;
output_power = efficiency_decimal * power;
% Energy required to lift mass
energy_required = mass * g * height;
% Time to lift
time = energy_required / output_power;
% Store results: power, efficiency, mass, height, time
results(:, k) = [power; efficiency; mass; height; time];
end
% Export results to CSV file
csvwrite('Task2_Results.csv', results);
% Display the matrix to verify
disp('Results matrix:');
disp(results);
%Task 3
output_powers = Specs(1, :) .* (Specs(2, :) / 100); % Output power for each motor
times = results(5, :); % Time from the results matrix
scatter(output_powers, times, 'filled');
xlabel('Output Power (W)');
ylabel('Time to Lift Load (s)');
title('Motor Output Power vs. Time to Lift Load');
grid on;

类别

在 Help Center 和 File Exchange 中查找有关 Programming 的更多信息

标签

产品


版本

R2024b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by