Problem with running anova

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?

[Adam Danz]

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]

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]

I applied the run feature to your code so we can see the results.

[Aitana Grasso]

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!

Answer 1

[Adam Danz]

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.