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Random Forest with paired observations: how to maintain subject separation
When using classifiers like SVM, I keep observations from each subject together by using a custom cross-validation partition. Ra...
2 months 前 | 1 个回答 | 0
1
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What is the right formula for the RBF 'KernelScale' of fitcsvm?
The RBF (Gaussian) kernel can be defined with either gamma or sigma: or where sigma is the standard deviation of the Gauss...
What is the right formula for the RBF 'KernelScale' of fitcsvm?
The RBF (Gaussian) kernel can be defined with either gamma or sigma: or where sigma is the standard deviation of the Gauss...
5 months 前 | 0
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Avoid negative sign with compose() when output is zero, e.g. '-0' or '-0.0'
Since it seems MATLAB doesn't have a function for this, here's the one I made. I also like Stephen23's idea of using a regular e...
Avoid negative sign with compose() when output is zero, e.g. '-0' or '-0.0'
Since it seems MATLAB doesn't have a function for this, here's the one I made. I also like Stephen23's idea of using a regular e...
7 months 前 | 0
提问
Avoid negative sign with compose() when output is zero, e.g. '-0' or '-0.0'
When compose outputs zero, it includes a negative sign if the number was negative, giving, e.g. -0 or -0.0. How can I avoid this...
7 months 前 | 3 个回答 | 0
3
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How can I get script's location when running one section of a script?
I seem to have found a workaround by creating a function in a separate .m in the same folder that calls mfilename("fullpath"), a...
How can I get script's location when running one section of a script?
I seem to have found a workaround by creating a function in a separate .m in the same folder that calls mfilename("fullpath"), a...
1 year 前 | 2
提问
How can I get script's location when running one section of a script?
I frequently run scripts one section at a time. I can be using different computers, remote desktops, etc., so the path changes. ...
1 year 前 | 2 个回答 | 0
2
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fitcdiscr bug: Why does "ClassNames" now have to be provided in alphanumerical order otherwise accuracy is terrible?
I received the following answer and workaround (using kfoldPredict) from Mathworks technical support: The bug here lies within ...
fitcdiscr bug: Why does "ClassNames" now have to be provided in alphanumerical order otherwise accuracy is terrible?
I received the following answer and workaround (using kfoldPredict) from Mathworks technical support: The bug here lies within ...
1 year 前 | 0
提问
fitPosterior warning: Why does fitPosterior output a warning when the transformation is a step function?
I'm training various SVM models and saving the output from MATLAB. The output has lots of these warning messages: Warning: Clas...
1 year 前 | 1 个回答 | 0
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fitcdiscr bug: Why does "ClassNames" now have to be provided in alphanumerical order otherwise accuracy is terrible?
[Update: There is a known bug in kfoldLoss. See answer and workaround from Mathworks technical support in the answers section] ...
1 year 前 | 2 个回答 | 0
2
个回答已回答
How to stop further execution of M-script by using command?
This doesn't answer your question, but something I use to stop a program without using an error message like error("Don't panic,...
How to stop further execution of M-script by using command?
This doesn't answer your question, but something I use to stop a program without using an error message like error("Don't panic,...
1 year 前 | 1
提问
kfoldLoss() values have inconsistent precision between different iterations of a loop
I am training an RBF SVM with leave-one-out cross-validation using 94 observations and I am surpised to find that the precision ...
1 year 前 | 1 个回答 | 0
1
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Possible to iterate over table rows without a loop index variable?
To iterate over the variables (columns) of a table, you can do this: my_table = table([1; 2; 3], [4; 5; 6], ["Seven"; "Eight"; ...
1 year 前 | 1 个回答 | 0
1
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How to output variables properly from a parfor loop
Having read over the documentation and Googled, I have an idea of what I'm not allowed to do in a parfor loop, but can't seem to...
1 year 前 | 1 个回答 | 0
1
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How can I check whether an argument is given or not (inputParser)?
Is there any reason not to use exist("arg_name", "var") ? It doesn't give a false positive for a global of the same name. Maybe...
How can I check whether an argument is given or not (inputParser)?
Is there any reason not to use exist("arg_name", "var") ? It doesn't give a false positive for a global of the same name. Maybe...
1 year 前 | 0
提问
Create confusion matrix from LDA model
It is easy to train an LDA model and find its accuracy by cross-validation as below: Mdl = fitcdiscr(data, "Response_var_name",...
1 year 前 | 1 个回答 | 0
1
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What is the best way to add empty rows to an existing table, to pre-allocate for more data?
Let's say I have a table that has 100 rows of ten variables and now I know I am going to need another 100 rows (or perhaps 100,0...
1 year 前 | 2 个回答 | 1
2
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How do I rename fields of a structure array?
Until Matlab (hopefully) introduces a rename field function, I would convert to a table then use renamevars() and then convert b...
How do I rename fields of a structure array?
Until Matlab (hopefully) introduces a rename field function, I would convert to a table then use renamevars() and then convert b...
1 year 前 | 0
