Dot indexing is not supported for variables of this type

Question

Aniket Manjare 2020-12-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/697670-dot-indexing-is-not-supported-for-variables-of-this-type

编辑： Walter Roberson 2020-12-20

i am trying to run this code but is not working can you please help me with this

%%
%Data Collection and Labeling
clc;
clear all;
labelPoints = {[2,50],[51,80]}; 
NoOfFailureModes = 2;
estimateRULFlags = [false, true]; 
path = 'Datasets/'; 
labels = {[categorical("OFF"),categorical("ON"),categorical("DUCT BLOCKAGE")],[categorical("OFF"),categorical("ON"),categorical("ROTOR IMBALANCE")]};
rawdata = cell(NoOfFailureModes);
data = cell(NoOfFailureModes);
for i = 1:NoOfFailureModes
    rawdata{i} = readtable([path 'Dataset' num2str(i) '.csv'],'Delimiter',','); %Read the downloaded csv file
    data{i} = dataParsing(rawdata{i},labelPoints{i},labels{i},i); %Parse the rawdata
end
function data = dataParsing(rawdata,labelPoints,labels,dataset)
    bias = 44;
    noOfDataPoints = length(rawdata.entry_id);
    labelPoints = [0 labelPoints noOfDataPoints];
    for i = 1:length(labelPoints)-1 
        Label(labelPoints(i)+1:labelPoints(i+1),:) = labels(i); %Create Labels for the data points
    end
    j = 1;
    if(dataset == 2)
        offset = 0;
    else
        offset = 2000;
    end
    for i = 1:noOfDataPoints
        text1 = strsplit(rawdata.field1{i},',');
        text2 = strsplit(rawdata.field2{i},',');
        text3 = strsplit(rawdata.field3{i},',');
        text4 = strsplit(rawdata.field4{i},',');
        text5 = strsplit(rawdata.field5{i},',');
        text6 = strsplit(rawdata.field6{i},',');
        var = zeros(length(text1)-1,6);
        flag = true;
        for k = 1:length(text1)-1 %to neglect the last comma, use -1 
           var(k,1) = str2num(text1{k})-bias;
           var(k,2) = str2num(text2{k})-bias;
           var(k,3) = str2num(text3{k})-bias;
           if(var(k,1) ~= -bias || var(k,2) ~= -bias || var(k,3) ~= -bias ) %Turning the device off and on will reset the first data set to all zeroes
               var(k,4) = str2num(text4{k})-bias;
               var(k,5) = str2num(text5{k})-bias;
               var(k,6) = str2num(text6{k})-bias;
           else
               flag = false;
               break;
           end
        end
        if(flag) %accept a valid datapoint
            data.Label(j,:) = Label(i);
            data.sno(j,:) = rawdata.entry_id(i) + offset;
            data.X(j,:) = [var(:,1);var(:,4)];
            data.Y(j,:) = [var(:,2);var(:,5)];
            data.Z(j,:) = [var(:,3);var(:,6)];
            j = j+1;
        end
    end
    data = struct2table(data);
end

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Adam Danz 2020-12-18

Provide the full error message, tell us what line is causing that error (the line number is included in the error message but we don't see line numbers so just tell us the line), and describe what variables are used in that line (class & size).

Aniket Manjare 2020-12-18

Here i have scrrenshot of error and i have also attaches the data set

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Answer 1

Walter Roberson 2020-12-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/697670-dot-indexing-is-not-supported-for-variables-of-this-type#answer_579760

在 MATLAB Online 中打开

    for i = 1:noOfDataPoints
        var1 = rawdata.field1(i);
        var2 = rawdata.field2(i);
        var3 = rawdata.field3(i);
        var4 = rawdata.field4(i);
        var5 = rawdata.field5(i);
        var6 = rawdata.field6(i);
        %Turning the device off and on will reset the first data set to all zeroes
        
        if var1 ~= 0 || var2 ~= 0 || var3 ~= 0
            var = [var1, var2, var3, var4, var5, var6] - bias;
            data.Label(j,:) = Label(i);
            data.sno(j,:) = rawdata.entry_id(i) + offset;
            data.X(j,:) = [var(1);var(4)];
            data.Y(j,:) = [var(2);var(5)];
            data.Z(j,:) = [var(3);var(6)];
            j = j+1;
        end
    end

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Aniket Manjare 2020-12-19

Thanks, i have labelled my data with code, Thakyou

Aniket Manjare 2020-12-19

在 MATLAB Online 中打开

I am facing the issue with the further part of the code. Please help me to solve this

The error is occuring here ar this point

P1 = P2(1:L/2+1)

Please find the attachment for program file .m and datasets files, Kindly help

below is the code for the exploration:

%%
%Data Exploration
fs = 100; %Sampling Frequency
L = 100; %Length of each data sample is 100 sensor readings
f = fs*(0:(L/2))/L; % Frequency bins until Nyquist Frequency at which FFT is computed
convertToMinutes = (1/fs)/60; %Convert sample number to minutes 0.01/60
votype = 'VideoWriter'; %Record the Exploration to view it again
vo = VideoWriter('Data Exploration Video', 'MPEG-4');
set(vo, 'FrameRate', 5); 
open(vo);
for i = 1:NoOfFailureModes
    NoOfDataPoints = height(data{i});
    x = zeros(L*NoOfDataPoints,0);
    y = zeros(L*NoOfDataPoints,0);
    z = zeros(L*NoOfDataPoints,0);
    figure;
    set(gcf,'Visible','on')
    for j = 1:NoOfDataPoints
        data{i}.X_FFT(j,:) = computeFFT(data{i}.X(j,:)-mean(data{i}.X(j,:)),L);  
        data{i}.Y_FFT(j,:) = computeFFT(data{i}.Y(j,:)-mean(data{i}.Y(j,:)),L);
        data{i}.Z_FFT(j,:) = computeFFT(data{i}.Z(j,:)-mean(data{i}.Z(j,:)),L);
        x((j-1)*L+1 : j*L) = data{i}.X(j,:);
        y((j-1)*L+1 : j*L) = data{i}.Y(j,:);
        z((j-1)*L+1 : j*L) = data{i}.Z(j,:);
        t = (1:j*L)*convertToMinutes;
        
        subplot(3,2,1); 
        plot(t,x);  
        title({"Experiment: " + num2str(i) , "Time Domain"});
        xlabel("time (min.)",'FontWeight','bold');
        ylabel("X",'rotation',0,'FontWeight','bold'); 
        
        subplot(3,2,2); 
        bar(f,data{i}.X_FFT(j,:)); 
        title({"Sample: " + num2str(j) + "; Label: " + char(data{i}.Label(j)), "Frequency Domain"});
        xlabel("frequency (Hz)",'FontWeight','bold');
        ylabel("X",'rotation',0,'FontWeight','bold'); 
        
        subplot(3,2,3); 
        plot(t,y); 
        xlabel("time (min.)",'FontWeight','bold');
        ylabel("Y",'rotation',0,'FontWeight','bold');
        
        subplot(3,2,4); 
        bar(f,data{i}.Y_FFT(j,:)); 
        xlabel("frequency (Hz)",'FontWeight','bold');
        ylabel("Y",'rotation',0,'FontWeight','bold');
        
        subplot(3,2,5); 
        plot(t,z); 
        xlabel("time (min.)",'FontWeight','bold');
        ylabel("Z",'rotation',0,'FontWeight','bold'); 
        
        subplot(3,2,6); 
        bar(f,data{i}.Z_FFT(j,:)); 
        xlabel("frequency (Hz)",'FontWeight','bold');
        ylabel("Z",'rotation',0,'FontWeight','bold'); 
        
        drawnow;
        writeVideo(vo, getframe(gcf));
    end
end
close(vo);
%%
%%
%Helper Functions
function P1 = computeFFT(X,L)
    Y = fft(X);
    P2 = abs(Y/L);%absolute value
    P1 = P2(1:L/2+1)
    P1(2:end-1) = 2*P1(2:end-1);
end
%%

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Answer 2

Cris LaPierre 2020-12-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/697670-dot-indexing-is-not-supported-for-variables-of-this-type#answer_579565

在 MATLAB Online 中打开

The error appears to be line 36

text1 = strsplit(rawdata.field1{i},',');

The current error is because the variable field1 contains numeric info. Brace indexing - {i} - is not valid for a vector of doubles. Use parentheses instead.

This will lead to your next error. The function strsplit is for text data. You will get another error:

Error using strsplit (line ##)

First input must be either a character vector or a string scalar.

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Aniket Manjare 2020-12-19

Please find the data set for 6 fields,

Please help me solve this problem, i have tried alot, mistakenly i have previously loaded the wrong data set

Here i have attached the file

Labelling.m
dataset1.csv
dataset2.csv

Aniket Manjare 2020-12-20

编辑：Walter Roberson 2020-12-20

Walter Roberson can you please help me to solve this Issue issue https://in.mathworks.com/matlabcentral/answers/698125-facing-issue-in-fft-p1-p2-1-l-2-

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