Turn sequence into a loop

Question

Victor 2024-5-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2123041-turn-sequence-into-a-loop

评论： Dyuman Joshi 2024-6-10

idler_1 = 17;

idler_2 = 17;

idler_3 = 17;

Z_gears(1) = 17;

% Z_gear(1) is defined same holds for the idler's

% Number of Z_gears is determined by N and gear_ratio_combo goes from (1,1)

% to (1,(columlength)

% idlers are on Z_gear place Z_gear(3),Z_gear(5),Z_gear(7) etc

% but if Z_gear(end) is uneven then do not place idler there

Z_gears(2) = Z_gears(1)*gear_ratio_combo(1,1);

Z_gears(3) = idler_1;

Z_gears(4) = Z_gears(3)*gear_ratio_combo(1,2);

Z_gears(5) = idler_2;

Z_gears(6) = Z_gears(5)*gear_ratio_combo(1,3);

Z_gears(7) = idler_3;

Z_gears(8) = Z_gears(7)*gear_ratio_combo(1,4);

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Answer 1

Sanju 2024-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/2123041-turn-sequence-into-a-loop#answer_1463971

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To turn the given sequence into a loop, you can use a for loop to iterate over the gear_ratio_combo and idler values. Here's an example of how you can modify the code,

Initialize idler and the first Z_gears value.
Determine the length of the gear_ratio_combo column.
Manually set the second gear value.
Use a loop to populate the rest of the Z_gears array,

If the index is even, assign idler.
If the index is odd, multiply the previous Z_gears value by the corresponding gear_ratio_combo.

idler = 17; % Since all idlers have the same value
Z_gears(1) = 17; % Initial gear value
% Define the number of gear ratios and Z_gears
column_length = size(gear_ratio_combo, 2);
Z_gears(2) = Z_gears(1) * gear_ratio_combo(1, 1);
% Loop to populate Z_gears
for i = 2:column_length
    if mod(i, 2) == 0
        Z_gears(i + 1) = idler;
    else
        Z_gears(i + 1) = Z_gears(i) * gear_ratio_combo(1, i);
    end
end

Hope this helps!

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Victor 2024-5-27

Thank you for responding, However the Z_gear can run to N=8 for example while the column length of the gear_ratio_combo can also differ

Sanju 2024-5-28

在 MATLAB Online 中打开

To handle varying lengths of gear_ratio_combo and Z_gears, you can use a nested for loop. Here's an updated code example,

idler_1 = 17;
idler_2 = 17;
idler_3 = 17;
Z_gears(1) = 17;
% Define gear_ratio_combo matrix
gear_ratio_combo = [1, 2, 3, 4];
% Preallocate Z_gears array
Z_gears = zeros(1, length(gear_ratio_combo)*2 + 1);
% Loop through gear_ratio_combo and idlers
for i = 1:length(gear_ratio_combo)
    Z_gears(2*i) = Z_gears(2*i-1) * gear_ratio_combo(i);
    if mod(Z_gears(2*i), 2) == 0
        Z_gears(2*i+1) = idler_1;
    end
end
% Additional loop for remaining idlers
for i = length(gear_ratio_combo)*2+2:length(Z_gears)
    if mod(i, 2) == 0
        Z_gears(i) = Z_gears(i-1) * gear_ratio_combo(i/2-1);
        if mod(Z_gears(i), 2) == 0
            Z_gears(i+1) = idler_1;
        end
    end
end

This updated code will handle cases where the length of gear_ratio_combo is different from the number of elements in Z_gears. The second loop will take care of adding the remaining idlers to Z_gears if necessary.

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Answer 2

Dyuman Joshi 2024-5-28

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A better approach would be to vectorize, see below. (I assume all the arrays to be used have compatible dimensions for operations performed)

Note that N must be equalto 2*columnlength.

N = 8;
%If the values for idlers are different then concatenate them in a  
%1D array and assign to Z_gear afterwards
Z_gear(1:2:N) = idler;
Z_gear(2:2:N) = Z_gear(1:2:N).*gear_ratio_combo(1,:);