Problem with running anova

2021 12 8
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更新时间：2021 12 15
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Hi everyone,
I have a question.
Turns out that when a create a linear model (using fitlm) and than I want to run an anova to that model I get this error:
Error using gather
Too many input arguments.
Error in classreg.regr.CompactLinearModel/componentanova (line 824)
[ss,df,ms,f,pval] = gather(ss,df,ms,f,pval);
Error in classreg.regr.CompactLinearModel/anova (line 319)
tbl = componentanova(model,sstype);
I had checked with colleagues and they don't have a "gather" function in line 824
Line 824: [ss,df,ms,f,pval] = gather(ss,df,ms,f,pval)
Does anyone knows what it could be?

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Adam Danz
Adam Danz 2021-12-8
编辑：Adam Danz 2021-12-8
These types of questions are easier to address if you provide a minimal working example that produces the error on your end. My shot-in-the-dark is that your shadowing a matlab function with a 3rd party function that contains the same name as the matlab function.
Note that Matlab does have a gather function (since R2016b) but it only contains 1 input. However, gather could be a shadowed method which is why it would be nice to quickly run a minimal working example.
Aitana Grasso
Aitana Grasso 2021-12-8
Ran in:
Ran in:
Thank you so much for your answer!
Here is my code:
y = [10.3 10.3 10.2 16.4 18.8 19.7 15.6 18.2 22.6 19.9 24.2 21 21.4 21.3 19.1 22.2 33.8 27.4 25.7 24.9 34.5 31.7 36.3 38.3 42.6 55.4 55.7 58.3 51.5 51 77]
y = 1×31
10.3000 10.3000 10.2000 16.4000 18.8000 19.7000 15.6000 18.2000 22.6000 19.9000 24.2000 21.0000 21.4000 21.3000 19.1000 22.2000 33.8000 27.4000 25.7000 24.9000 34.5000 31.7000 36.3000 38.3000 42.6000 55.4000 55.7000 58.3000 51.5000 51.0000
x = [70 65 63 72 81 83 66 75 80 75 79 76 76 69 75 74 85 86 71 64 78 80 74 72 77 81 82 80 80 80 87]
x = 1×31
70 65 63 72 81 83 66 75 80 75 79 76 76 69 75 74 85 86 71 64 78 80 74 72 77 81 82 80 80 80
mdl = fitlm(x,y) % this runs without problem
mdl =
Linear regression model: y ~ 1 + x1 Estimated Coefficients: Estimate SE tStat pValue ________ _______ _______ __________ (Intercept) -87.124 29.273 -2.9762 0.0058347 x1 1.5433 0.38387 4.0205 0.00037838 Number of observations: 31, Error degrees of freedom: 29 Root Mean Squared Error: 13.4 R-squared: 0.358, Adjusted R-Squared: 0.336 F-statistic vs. constant model: 16.2, p-value = 0.000378
p = anova(mdl) % here is the error. (I have try with all posible anova functions -anova1, anova2, anovan-).
p = 2×5 table
SumSq DF MeanSq F pValue ______ __ ______ ______ __________ x1 2901.2 1 2901.2 16.164 0.00037838 Error 5204.9 29 179.48
When I run the last line I got the error showed before.
I'm using R2021a
Adam Danz
Adam Danz 2021-12-15
I applied the run feature to your code so we can see the results.
Aitana Grasso
Aitana Grasso 2021-12-15
Hello Adam,
Thank you so much for your help.
Apparently de problem was in my MATLAB, so I had to uninstall and install again.
Now everything is running perfectly!

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Adam Danz
Adam Danz 2021-12-8
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Ran in:
It looks like you've shadowed matlab's gather function with a function or script of the same name.
To see a list of functions named gather,
which gather -all
/MATLAB/toolbox/matlab/bigdata/gather.m /MATLAB/toolbox/matlab/bigdata/@tall/gather.m % Shadowed tall method /MATLAB/toolbox/nnet/deep/@dlarray/gather.m % Shadowed dlarray method /MATLAB/toolbox/parallel/gpu/@gpuArray/gather.m % Shadowed gpuArray method /MATLAB/toolbox/parallel/parallel/@distributed/gather.m % Shadowed distributed method /MATLAB/toolbox/parallel/parallel/@codistributed/gather.m % Shadowed codistributed method
Then remove your shadowed file from the Matlab path or rename the file.

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