How do I fix this error?

Question

Winston Sabellona 2022-5-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1724070-how-do-i-fix-this-error

编辑： Winston Sabellona 2022-5-22

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

%$Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 0-by-1.

%$Error in machine_problem (line 39)

%$ p_new(j,1) = w*a + z*b; "

%code
states = [0; 3; 3; 5; 6; 8; 8; 11];
fors = [0.02;0.02;0.02];
capacities =[3;3;5];
p_old = 0;
for i=1:length(capacities)
    
    fprintf('Adding unit: %d \n',i);
    
    p_new = 0;
    for j = 1:(2^i)
        
        
        
        
        if states(j,1) == 0
            [a]= 1;
            
        elseif j >= (2^i)
            [a] =0;
        end
        
        if (states(j,1) - capacities(i,1)) <= 0
            [b] = 1  ;  
        else
            x = find(states == (states(j,1)-capacities(i,1)));
            [b] = p_old(x,1);
        end
        
        [w] = 1 - fors(i,1)
        
        [z] = fors(i,1) 
        
        p_new(j,1) = w*a + z*b;
        
        
    end
    p_old = p_new;
    
    disp(p_new);
    
    
    
end

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Answer 1

Walter Roberson 2022-5-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1724070-how-do-i-fix-this-error#answer_968565

在 MATLAB Online 中打开

        if states(j,1) == 0
            [a]= 1;
        elseif j >= (2^i)
            [a] =0;
        end

what if neither of those is true? What will a be initialized to?

x = find(states == (states(j,1)-capacities(i,1)));

How do you know that exactly one such location exists?

2 个评论
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Winston Sabellona 2022-5-21

Thank you Mr. Roberson. Honestly, im stuck with this. Do you have any recommendations pls?

Walter Roberson 2022-5-22

在 MATLAB Online 中打开

%code
states = [0; 3; 3; 5; 6; 8; 8; 11];
fors = [0.02;0.02;0.02];
capacities =[3;3;5];
p_old = 0;
for i=1:length(capacities)
    
    fprintf('Adding unit: %d \n',i);
    
    p_new = 0;
    for j = 1:(2^i)
        
        
        
        
        if states(j,1) == 0
            [a]= 1;
            
        elseif j >= (2^i)
            [a] =0;
        else
            error('a undefined');
        end
        
        if (states(j,1) - capacities(i,1)) <= 0
            [b] = 1  ;  
        else
            x = find(states == (states(j,1)-capacities(i,1)));
            [b] = p_old(x,1);
        end
        
        [w] = 1 - fors(i,1)
        
        [z] = fors(i,1) 
        temp = w*a + z*b;
        p_new(j,1:numel(temp)) = temp;
    end
    p_old = p_new;
    
    display(p_new);
    
    
end
Adding unit: 1 
w = 0.9800
z = 0.0200
w = 0.9800
z = 0.0200
p_new = 2×1
    1.0000
    0.0200
Adding unit: 2 
w = 0.9800
z = 0.0200
a undefined