how to incorporating a dataset in the form of a struct into a function in a for loop

Question

Muhammad 2021-9-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1445129-how-to-incorporating-a-dataset-in-the-form-of-a-struct-into-a-function-in-a-for-loop

评论： Muhammad 2021-9-2

采纳的回答： Walter Roberson

dataset.mat

在 MATLAB Online 中打开

i havee written the following code and getting error

fileName= {'Mert'};
nameExt= {'dataset.'};
snameExt= string(nameExt);
nfileName= string(fileName);
load('dataset.mat')
for i1= 1:length(nfileName)
movName={'AOG'};%,'FUZ','FUZY','MaW','NoW','OAK'};
nmovName= string(movName);
for i2=1:length(nmovName)
repName={'Bir','iki','uc'};
nrepName= string(repName);
for i3=1:length(nrepName)
fTime={'TO'};%'TS'};
nfTime= string(fTime);
for i4=1:length(nfTime)
segName= {'L5S1','L3L4','T12L1','T8T9','C7T1','C1Head','RT4Shoulder','RShoulder','RElbow','RWrist','LT4Shoulder','LShoulder','LElbow','LWrist',...
                    'RHip','RKnee','RAnkle','RBallFoot','LHip','LKnee','LAnkle','LBallFoot'};
nsegName=string(segName);                                 
for i5= 1:length(nsegName)
rotName={'_x','_y','_z'};
nrotName=string(rotName);
for i6=1:length(nrotName)
infileName(i1)= snameExt+nfileName(i1)+'.'+nmovName(i2)+'.'+nrepName(i3)+'.'+nfTime(i4)+'.'+nsegName(i5)+nrotName(i6)+'.'+'jointAngle';
for k = 1: length(infileName)
    new_data=[];
B=[];
B(k)= (infileName(k));
x = linspace(0, 100, length((infileName)));
y = 1:100;
new_data = spline(x, [(infileName) y]);
 normalized.(infileName(k))=(new_data(k));
end
end
end
end
end
end
end

errors

Error using chckxy (line 42)
There should be at least two data points.
Error in spline (line 53)
[x,y,sizey,endslopes] = chckxy(x,y);
Error in incorporatingdataset (line 31)
new_data = spline(x, [(infileName) y]);

i also attached the dataset file

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Answer 1

Walter Roberson 2021-9-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1445129-how-to-incorporating-a-dataset-in-the-form-of-a-struct-into-a-function-in-a-for-loop#answer_779274

在 MATLAB Online 中打开

infileName(i1)= snameExt+nfileName(i1)+'.'+nmovName(i2)+'.'+nrepName(i3)+'.'+nfTime(i4)+'.'+nsegName(i5)+nrotName(i6)+'.'+'jointAngle';

The right hand side will be a string object that is probably intended to represent a file name

B(k)= (infileName(k));

with infileName being a string array, then B(k) will be a string scalar that is the file name (likely). But you do not use B after that anyhow.

new_data = spline(x, [(infileName) y]);

infileName is a vector of string objects. You use the entire string vector. When you [] that together with numeric y, then numeric y will be converted to string object using a process similar to as-if you had used compose("%g", y). WIth the [] that string vector would be added after the vector of string objects in infileName, creating a longer vector of string objects.

Then spline() would be called, passing in x as the first parameter, and passing in that string vector of filenames and y values as the second parameter. And that is a problem. Notice that you never read anything in from a file.

Ah, I see now, you are computing a path into a struct, as a string object. But you are not telling MATLAB to evaluate to get to the struct contents.

With that context, then:

infileName(i1)= snameExt+nfileName(i1)+'.'+nmovName(i2)+'.'+nrepName(i3)+'.'+nfTime(i4)+'.'+nsegName(i5)+nrotName(i6)+'.'+'jointAngle';

No, instead use

ThisData = dataset.(nfileName(i1)).(nmovName(i2)).(nrepName(i3)).(nfTime(i4)).(nsegName(i5)).(nrotName(i6)).jointAngle;

ThisData will then be the actual content. Do something appropriate with it. Store if you need to.

There are more efficient ways to process this instead of going down the full chain dynamically every time, but this will get you started.

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Muhammad 2021-9-2

在 MATLAB Online 中打开

ThisData = dataset.(nfileName(i1)).(nmovName(i2)).(nrepName(i3)).(nfTime(i4)).(nsegName(i5)).(nrotName(i6)).jointAngle;

i have 40 patients data so i have 40 in fileName, i have 13 different movement patern in nmovName, i have 3 trials, i have 22 joints in nSegName, i have 3 axis in nrot name and all this data i recorded two times (pre-treatment-post treatment).

so i want to read each of this variables

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