Indexing Values from a structure array

Question

Tyrell Warrick 2019-3-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448480-indexing-values-from-a-structure-array

关闭： MATLAB Answer Bot 2021-8-20

Positive_Torque_Values = double.empty;
Speed_Values = double.empty;
index = 1;
index2 = 1;
for i = HL_simout.Motor_Torque.Data(index)
    if HL_simout.Motor_Torque.Data(index) >=  0 
        Positive_Torque_Values(index)= HL_simout.Motor_Torque.Data(index) ;
        Speed_Values(index2)= HL_simout.Motor_Speed.Data(index);
        index2 = index2 + 1;
    end 
     index = index + 1;
end 
a = size(Speed_Values);
b = size(Positive_Torque_Values);
disp(a)
disp(b)
title('Motor Torque Vs Motor Speed')
scatter(Speed_Values,Positive_Torque_Values)
xlabel('Motor Speed [RPM]')
ylabel('Motor Torque [Nm]')

I'm trying to take values from a column of data stored in a structure created by MATLAB simulink and take all the values grearer than zero(0) and store it in a seprate array. However, im only getting one value in the new array hence its not going through the entire structure list

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darova 2019-3-6

在 MATLAB Online 中打开

index2 = 1;
n = length(HL_simout.MOtor_Torque.Data);        % number of rows
for i = 1:n
    if HL_simout.Motor_Torque.Data(i) >=  0 
        Positive_Torque_Values(index2)= HL_simout.Motor_Torque.Data(i) ;
        Speed_Values(index2)= HL_simout.Motor_Speed.Data(i);
        index2 = index2 + 1;
    end 
end 

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Answer 1

Agnish Dutta 2019-3-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448480-indexing-values-from-a-structure-array#answer_365818

在 MATLAB Online 中打开

You can use logical indexing to obatin the non zero values from the structure arrays as per the code below:

Positive_Torque_Values = HL_simout.Motor_Torque.Data(HL_simout.Motor_Torque.Data > 0);
Speed_Values = HL_simout.Motor_Speed.Data(HL_simout.Motor_Torque.Data > 0);

From the code that you've provided, I'm assuming that you want the values of Speed and Torque at all those points where the Torque is greater than zero.

Refer to the logical indexing section of the following document for more information:

https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html