Error in following MATLAB codes: "Array indices must be positive integers or logical values."

When I run following codes it show following error: Array indices must be positive integers or logical values.:

x4 = [0,0,0,0,0,0,0,0,0,0,20.10,386.22,1013.36,1688.74,2685.19,2905.13,3370.94,3730.35, 2232.83,4166.60,4404.63,4853.86,4953.58,3897.27,2996.94,4328.13,4293.91,3655.74,3593.10,3080.08,2633.71,2058.05,1374.24,697.60,213.83,41.52,0,0,0,0,0,0,0,0,0,0,0,0];
x5 = [3498.91,3506.20,3491.12,3515.54,3490.08,3546.83,3491.12,3631.95,3895.54,3647.16,3498.37,3548.29,3525.54,3415.20,3394.50,3426.41,3413.20,3409.79,6531.87,6317.20,6433.33,6075.83,5983.62,5525.04,5650,5276.16,5885.04,5169.33,5908.37,5376.66,5733.37,5243.58,5792,5384.25,5408.95,5408.66,3662.29,3701.54,3688.41,3648.87,3648.58,3594.5,3521.12,3653.87,3771.70,3767.20,3541.04,3532.16];
E_batt_inst = 80000;
x3Max = 72000;
x3Min = 8000;
x2Min = -5000;
x2Max = 5000;
x1Min = 0;
x1 = zeros(48,1);
x2 = zeros(48,1);
x3 = zeros(48,1);
for t = 1:48
    if t<14 && t>40
        x1Max = 4500;
    elseif t>14 && t<=40
        x1Max = 3000;
    end
    if t==1
        x3 = 40000;
        flag = 1;
    end
    if x1(t)>x1Max
        x1(t) =  x1Max;
    elseif x1(t)<x1Min
        x1(t) = x1Min;
    end
    if x2(t)>x2Max
        x2(t) =  x2Max;
    elseif x2(t)<x2Min
        x2(t) = x2Min;
    end
    if x3(t)>x3Max
        x3(t) =  x3Max;
    elseif x3(t)<x3Min
        x3(t) = x3Min;
    end
    if (flag == 1)&&(x3 <= 8000)
        x2(t)=  x5(t) - x4(t)
    elseif x2(t)< x5(t) - x4(t)
        x1(t)=  x5(t) - x4(t) - x2(t)
        y = t-1;
        x3(t) = x3(y) - (x2(t)/E_batt_inst);
        flag = 1;
    elseif (x3 >= 72000)
        flag = 0;
        x2(t)=  x5(t) - x4(t)
    elseif x2(t)< x5(t) - x4(t)
        x1(t)=  x5(t) - x4(t) - x2(t)
        y = t-1;
        x3(t) = x3(y) - (x2(t)/E_batt_inst);
    end
end

Here x1, x2 and x3 is measured by given equation. x2 is power of battery which is charging and dischargine with respect to maximum and minimum capacity (x3) of battery. x1 is power imported from diesel generator. Battery is not allowed to discharge when its charged and flag = 1. When charging than battery power is in negative (-5000 (x2Min)) while discharge it is positive (5000 (x2Max)).

Answer 1

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