I am having a hard time grasping plotting in matlab, when I run this line:
gscatter(wine1.Alcohol,wine1.Ash,wine1.Class,'br','xo')
It shows:
But I obviouly want the third class to be a different color, how can I do that?
So I solved it with this:
gscatter(wine1.Alcohol,wine1.Ash,wine1.Class,'rgb','osd')
which gives me:
Awesome it works!
Related
I am applying SHAP on XGBoost regressor. I am trying to plot the interaction effects. But the summary plot is displaying only few variables. What to do in case of more than 10 variables?
I tried using "shap.summary_plot(shap_interaction_values, X)" but this is showing only 6 variables whereas I want it to show all the variables in the model which is 16.
Have you tried using the max_display parameter yet?
Documentation: https://shap-lrjball.readthedocs.io/en/latest/generated/shap.summary_plot.html
For example:
shap.summary_plot(shap_interaction_values, X, max_display=20)
I'm just starting to learn MatLab.
This is what I'd like to convert into MatLab code:
http://postimg.org/image/jqdvcrbod/
Since a lot of my variables are functions or other variables, does that mean that when I write them as functions in MatLab I have to save each of the functions as a separate file? Is there any other way? I don't want to end up with a million separate files, but as of right now, if I write more then one function in the editor, it starts getting confused and doesn't recognize the second function.
Also, is there a way to use actual symbols (like the square root symbol instead of writing "sqrt()") like in Mathematica? I feel like long equations (like the last one) are easier on the eye that way, but that's purely aesthetics.
Is there a way to have MatLab output unassigned variables? Like in Mathematica, if I have y(x) = 2x, if i don't put anything for x, it just outputs 2x.
One quick way to do is use a package in Mathematica called ToMatlab (I attached the download link). It is able to convert Mathematica symbol syntax to Matlab .m file.
Hope this would help.
I am working on some scripts for which I use several functions from the EEGLAB package for matlab. Most of these functions make it possible to surpress the GUI from showing, for example using f( ... 'gui','off'), or by using a different version of the same function. However, I can not figure out how to do this for the function pop_eegfiltnew(). Two similar functions are eegfilt(), which seems to be an outdated version of the function, and firfilt() however, pop_eegfiltnew() has more arguments than these other two, so they are certainly not the same in functional terms.
Anyone knows how to get around this?
If you supply enough arguments to pop_eegfiltnew it does not pop up a GUI.
For example if you wanted to filter your signal 1 Hz highpass you would:
EEG = pop_eegfiltnew(EEG, 1, 0);
This is because the first argument of pop_eegfilt is EEG structure, the second is locutoff (lower edge of the passband) and the third is hicutoff (higher edge of the passband).
I'm trying to write a bit of code of to make MATLAB scatter plots from variables in a structure. I want to give the code the name of the structure (there will be many of these structures) and then get it to make a scatter plot of two variables. When I try the code below I get an error message saying, "??? Error: File: make_graphs.m Line: 6 Column: 9
The input character is not valid in MATLAB statements or expressions."
str2stuct= input('Please enter the string for the struct e.g. TMB_RUN_1_data:');
test1=strcat(str2stuct,'.NDROP_max');
test2=strcat(str2stuct,'.input_kappa');
scatter($(test2), $(test1))
I thought that the error message probably meant that I was using the dollar sign in a way which MATLAB doesn't approve of (I've yet to find much use for $ in MATLAB).
I tried it like this:
str2stuct= input('Please enter the string for the struct e.g. TMB_RUN_1_data:');
test1=strcat(str2stuct,'.NDROP_max');
test2=strcat(str2stuct,'.input_kappa');
scatter((test2),(test1))
And got this error:
"??? Error using ==> scatter at 51
Must supply X and Y data as first arguments.
Error in ==> make_graphs at 6
scatter((test2),(test1)) "
I tried it with changing the last line as shown below but got the same error as with the brackets:
scatter(test2,test1)
If I use the literal name as below it works fine.
scatter(TMB_RUN_1_data.NDROP_max,TMB_RUN_1_data.input_kappa)
I've tried a bunch of other things but I am not getting it. I've tried the mathworks pages on scatter but there are no examples that are close to what I am doing. I am really really stuck.
EDIT: I have found a solution but I am aware that this is not considered best practice. If you can simply explain how to do this better that would be good. Answers should be aimed at a moron in a hurry, not an experienced programmer.
Making this the last line works:
scatter(eval(test2),eval(test1))
I am aware that 'eval' is frowned upon and so this probably isn't a good long term answer, works for now. This seems to be the way to get MATLAB to actually read the contents of the strings test1 and test2 into the lines in question.
http://www.mathworks.com/help/techdoc/ref/fftshift.html
If you check that link - thats what I want to do in the first picture - swap quadrants of a matrix.
However, I cant seem to think of a good way to do this without having several loops to pull out the relevant sub-matrices.
I need it to work with MxN matrices, where M and N can be any combination of even and odd.
Thanks
The following should work
sz = ceil(size(A)/2)
A = A([sz(1)+1:end, 1:sz(1)], [sz(2)+1:end, 1:sz(2)])
That only works for 2d matrices, but can be easily generalized to the Nd case.
If you enter type fftshift.m at MATLAB's command line, you'll see the source code for MATLAB's implementation of the function (use edit fftshift.m if you want to view it in the editor with syntax highlighting). I'm not posting the code here, as it is copyrighted. However, you can try it on your machine and re-implement the same in C. Its up to you to figure out the license terms etc, if you're into any of that.