How to reduce the Run time and improve the performance of my code

Question

Kumar 2020-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/654823-how-to-reduce-the-run-time-and-improve-the-performance-of-my-code

回答： Prudhvi Peddagoni 2020-11-24

Hello,

I would like to improve the performance of code and reduce run time.

Explanation: Here I am loading multiple mat files (now I will load 8 files) and calculate the maximum deviation and plot the results wrt RotorSpeed.

%Program to find the Maximum Phase Current Deviation at certain speed
% range
% Load the measuremnet file
files = dir('*.mat'); % look for .mat files in the folder
for k = 1:numel(files)
    S = load(files(k).name);
% Assign the data from the files to variables 
RotSpeed = abs(S.M1.Y(34).Data); % RotorSpeed
DevU = (S.M1.Y(20).Data); % Deviation of U
DevV = (S.M1.Y(21).Data); % Deviation of V
DevW = (S.M1.Y(22).Data); % Deviation of W
DevX = (S.M1.Y(23).Data); % Deviation of X
DevY = (S.M1.Y(24).Data); % Deviation of Y
% Variables for maximum deviation of phase currents U, V, W, X, Y
maxDevU =zeros; maxDevV = zeros; maxDevW = zeros; maxDevX = zeros; maxDevY = zeros;
% Variable for the maximum deviation of phase currents
for i= 1:length (RotSpeed)-1 % Calculate the MaxDeviation of U, V, W, X, Y
    maxDevU(i) = max(DevU(i:i));
    maxDevV(i) = max(DevV(i:i));
    maxDevW(i) = max(DevW(i:i));
    maxDevX(i) = max(DevX(i:i));
    maxDevY(i) = max(DevY(i:i));
  maxDev = zeros;
  maxDev(i)= max([maxDevU(i),maxDevV(i),maxDevW(i),maxDevX(i),maxDevY(i)]);
end   
for j= 1:length(RotSpeed)-1 % Calculate the Maximum Deviation of UVWXY at certain speeds
    
    if RotSpeed(j) > 0.1 && RotSpeed(j)<= 1
        
        maxDev0(j) = max(maxDev(j));
        maxDev0_0 = max(maxDev0);
       % maxDevTh0(j) = max(maxDev0_0);
        
    elseif RotSpeed(j) >1 && RotSpeed(j+1) <= 500
        
        maxDev1(j) = max(maxDev(j));
        maxDev1_1 = max(maxDev1);
       % maxDevTh1 = max(maxDev1_1);
        
    elseif RotSpeed(j)>500 && RotSpeed(j+1)<=1000
       
        maxDev2(j)= max(maxDev(j));
        maxDev2_2 = max(maxDev2);
       % maxDevTh2 = max(maxDev2_2);
    
    elseif RotSpeed(j)>1000 && RotSpeed(j+1) <=1500   
       
        maxDev3(j)= max(maxDev(j));
        maxDev3_3 = max(maxDev3);
      % maxDevTh3 = max(maxDev3_3);
        
    elseif RotSpeed(j)>1500 && RotSpeed(j)<=2000    
       
        maxDev4(j)= max(maxDev(j));
        maxDev4_4 = max(maxDev4);
      % maxDevTh4 = max(maxDev4_4);
        
    elseif RotSpeed(j)>2000 && RotSpeed(j)<=2500    
       
        maxDev5(j)= max(maxDev(j)); 
        maxDev5_5 = max(maxDev5);
      % maxDevTh5 = max(maxDev5_5);
        
    elseif RotSpeed(j)>2500 && RotSpeed(j)<=3000    
        
        maxDev6(j)= max(maxDev(j));
        maxDev6_6 = max(maxDev6);
      % maxDevTh6 = max(maxDev6_6);
        
    elseif RotSpeed(j)>3000 && RotSpeed(j)<=3500    
       
        maxDev7(j)= max(maxDev(j));
        maxDev7_7 = max(maxDev7);
      % maxDevTh7 = max(maxDev7_7);
        
    elseif RotSpeed(j)>3500 && RotSpeed(j)<=4000    
       
        maxDev8(j)= max(maxDev(j));
        maxDev8_8 = max(maxDev8);
      % maxDevTh8 = max(maxDev8_8);
    
    elseif RotSpeed(j)>4000 && RotSpeed(j)<=4500    
       
        maxDev9(j)= max(maxDev(j));
        maxDev9_9 = max(maxDev9);
      % maxDevTh9 = max(maxDev9_9);
        
     elseif RotSpeed(j)>4500 && RotSpeed(j)<=5000    
        
        maxDev10(j)= max(maxDev(j));
        maxDev10_10 = max(maxDev10);
      % maxDevTh10 = max(maxDev10_10);
        
     elseif RotSpeed(j)>5000 && RotSpeed(j)<=5500    
       
        maxDev11(j)= max(maxDev(j));
        maxDev11_11 = max(maxDev11);
      % maxDevTh11 = max(maxDev11_11);
        
     elseif RotSpeed(j)>5500 && RotSpeed(j)<=6000    
        
        
        maxDev12(j)= max(maxDev(j));
        maxDev12_12 = max(maxDev12);
      % maxDevTh12 = max(maxDev12_12);
        
     elseif RotSpeed(j)>6000 && RotSpeed(j)<=6500    
       
        maxDev13(j)= max(maxDev(j));
        maxDev13_13 = max(maxDev13);
      % maxDevTh13 = max(maxDev13_13);
        
     elseif RotSpeed(j)>6500 && RotSpeed(j)<=7000    
        
        maxDev14(j)= max(maxDev(j));
        maxDev14_14 = max(maxDev14);
      % maxDevTh14 = max(maxDev14_14);
     
    elseif RotSpeed(j)>7000 && RotSpeed(j)<=7500    
       
        maxDev15(j)= max(maxDev(j));
        maxDev15_15 = max(maxDev15);
      % maxDevTh15 = max(maxDev15_15);
        
    elseif RotSpeed(j)>7500 && RotSpeed(j)<=8000    
      
        maxDev16(j)= max(maxDev(j));
        maxDev16_16 = max(maxDev16);
      % maxDevTh16 = max(maxDev16_16);
        
    elseif RotSpeed(j)>8000 && RotSpeed(j)<=8500   
       
        maxDev17(j)= max(maxDev(j));
        maxDev17_17 = max(maxDev17);
      % maxDevTh17 = max(maxDev17_17);
        
    elseif RotSpeed(j)>8500 && RotSpeed(j)<=9000    
       
        maxDev18(j)= max(maxDev(j));
        maxDev18_18 = max(maxDev18);
      % maxDevTh18 = max(maxDev18_18);
    
    elseif RotSpeed(j)>9000 && RotSpeed(j)<=9500    
       
        maxDev19(j)= max(maxDev(j));
        maxDev19_19 = max(maxDev19);
      % maxDevTh19 = max(maxDev19_19);
        
    elseif RotSpeed(j)>9500 && RotSpeed(j)<=10000    
       
        maxDev20(j)= max(maxDev(j));
        maxDev20_20 = max(maxDev20);
      % maxDevTh20 = max(maxDev20_20);
    
    elseif RotSpeed(j)>10000 && RotSpeed(j)<=10500    
       
        maxDev21(j)= max(maxDev(j));
        maxDev21_21 = max(maxDev21);
      % maxDevTh21 = max(maxDev21_21);
        
    elseif RotSpeed(j)>10500 && RotSpeed(j)<=11000    
       
        maxDev22(j)= max(maxDev(j));
        maxDev22_22 = max(maxDev22);
      % maxDevTh22 = max(maxDev22_22);
        
    elseif RotSpeed(j)>11000 && RotSpeed(j)<=11500    
        
        maxDev23(j)= max(maxDev(j));
        maxDev23_23 = max(maxDev23);
      % maxDevTh23 = max(maxDev23_23);
    
    elseif RotSpeed(j)>11500 && RotSpeed(j)<=12000    
       
        maxDev24(j)= max(maxDev(j));
        maxDev24_24 = max(maxDev24);
      % maxDevTh24 = max(maxDev24_24);
    
    elseif RotSpeed(j)>12000 && RotSpeed(j)<=12500    
        
        maxDev25(j)= max(maxDev(j));
        maxDev25_25 = max(maxDev25);
      % maxDevTh25 = max(maxDev25_25);
    
    elseif RotSpeed(j)>12500 && RotSpeed(j)<=13000    
       
        maxDev26(j)= max(maxDev(j)); 
        maxDev26_26 = max(maxDev26);
      % maxDevTh26 = max(maxDev26_26);
    
    elseif RotSpeed(j)>13000 && RotSpeed(j)<=13500    
       
        maxDev27(j)= max(maxDev(j)); 
        maxDev27_27 = max(maxDev27);
      % maxDevTh27 = max(maxDev27_27);
    
    elseif RotSpeed(j)>13500 && RotSpeed(j)<=14000    
       
        maxDev28(j)= max(maxDev(j)); 
        maxDev28_28 = max(maxDev28);
      % maxDevTh28 = max(maxDev28_28);
        
    elseif RotSpeed(j)>14000 && RotSpeed(j)<=14500    
       
        maxDev29(j)= max(maxDev(j));
        maxDev29_29 = max(maxDev29);
      % maxDevTh29 = max(maxDev29_29);
    
    elseif RotSpeed(j)>14500 && RotSpeed(j)<=15000    
       
        maxDev30(j)= max(maxDev(j));
        maxDev30_30 = max(maxDev30);
      % maxDevTh30 = max(maxDev30_30);
        
    elseif RotSpeed(j)>15000 && RotSpeed(j)<=15500    
       
        maxDev31(j)= max(maxDev(j)); 
        maxDev31_31 = max(maxDev31);
      % maxDevTh31 = max(maxDev31_31);
        
    elseif RotSpeed(j)>15500 && RotSpeed(j)<=16000    
        
        maxDev32(j)= max(maxDev(j)); 
        maxDev32_32 = max(maxDev32);
      % maxDevTh32 = max(maxDev32_32);
    
    elseif RotSpeed(j)>16000 && RotSpeed(j)<=16500    
       
        maxDev33(j)= max(maxDev(j));
        maxDev33_33 = max(maxDev33);
      % maxDevTh33 = max(maxDev33_33);
        
    elseif RotSpeed(j)>16500 && RotSpeed(j)<=17000    
       
        maxDev34(j)= max(maxDev(j)); 
        maxDev34_34 = max(maxDev34);
      % maxDevTh34 = max(maxDev34_34);
   
    elseif RotSpeed(j)>17000 && RotSpeed(j)<=17500    
       
        maxDev35(j)= max(maxDev(j));
        maxDev35_35 = max(maxDev35);
      % maxDevTh35 = max(maxDev35_35);
    
    elseif RotSpeed(j)>17500 && RotSpeed(j)<=18000    
       
        maxDev36(j)= max(maxDev(j));
        maxDev36_36 = max(maxDev36);
      % maxDevTh36 = max(maxDev36_36);
     
    end
    
end
%ploting RotorSpeed steps versus Maximum deviation 
n_Step = (0:500:18000); % x axis RotSpeed in steps of 500rpm
% y axis maximum deviation at each speed range of 500 rpm till 18000rpm
maxDevn_n = ([maxDev0_0, maxDev1_1, maxDev2_2, maxDev3_3, maxDev4_4, maxDev5_5, maxDev6_6...
    maxDev7_7, maxDev8_8, maxDev9_9, maxDev10_10, maxDev11_11, maxDev12_12...
    maxDev13_13, maxDev14_14, maxDev15_15, maxDev16_16, maxDev17_17, maxDev18_18...
    maxDev19_19, maxDev20_20, maxDev21_21, maxDev22_22, maxDev23_23...
    maxDev24_24, maxDev25_25, maxDev26_26, maxDev27_27, maxDev28_28...
    maxDev29_29, maxDev30_30, maxDev31_31, maxDev32_32, maxDev33_33...
    maxDev34_34, maxDev35_35, maxDev36_36]);
plot(n_Step,maxDevn_n);
hold on
xlabel('RotorSpeed rpm')
ylabel('PhaseCurrent A')
end

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Answer 1

Prudhvi Peddagoni 2020-11-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/654823-how-to-reduce-the-run-time-and-improve-the-performance-of-my-code#answer_554283

在 MATLAB Online 中打开

Hi,

Instead of the last for-loop, you can do this:

maxDev0_0=max(maxDev(RotSpeed(j) > 0.1 && RotSpeed(j)<= 1)); %this is for the first if condition only

So basically you are computing maximum at every iteration when you finding the maximum at the end is enough.

Hope this helps.

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