Thread Subject:

boxplot, grouping variables

Hi,
I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?

Thank you very much!

Valentina

Hi Valentina,

try following:
group = [ones(size(t1);ones(size(t2))+1;ones(size(t3))+2];
x = cat(1,t1,t2,t3);
boxplot(x,group);

HTH



"Valentina " <vrossett82@gmail.com> wrote in message <h1fme2$3nn$1@fred.mathworks.com>...
> Hi,
> I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?
>
> Thank you very much!
>
> Valentina

Thank you very much, it worked perfectly!

Valentina

"Anon " <none@none.com> wrote in message <h1fqmd$1e9$1@fred.mathworks.com>...
> Hi Valentina,
>
> try following:
> group = [ones(size(t1);ones(size(t2))+1;ones(size(t3))+2];
> x = cat(1,t1,t2,t3);
> boxplot(x,group);
>
> HTH
>
>
>
> "Valentina " <vrossett82@gmail.com> wrote in message <h1fme2$3nn$1@fred.mathworks.com>...
> > Hi,
> > I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?
> >
> > Thank you very much!
> >
> > Valentina

"Anon" wrote in message <h1fqmd$1e9$1@fred.mathworks.com>...
> Hi Valentina,
>
> try following:
> group = [ones(size(t1);ones(size(t2))+1;ones(size(t3))+2];
> x = cat(1,t1,t2,t3);
> boxplot(x,group);
>
> HTH
>
>
>
> "Valentina " <vrossett82@gmail.com> wrote in message <h1fme2$3nn$1@fred.mathworks.com>...
> > Hi,
> > I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?
> >
> > Thank you very much!
> >
> > Valentina

Hi HTH,

The code worked great, however, it does not allowed me to add labels like before.

My previous code was :

figure
hold
subplot(1,3,1)
boxplot([M_GO M_NOGO3], 'notch';'on';...
    'labels';{'Go','No Go'})
        ylabel('Reaction Time(ms)')
        xlabel('GO vs NOGO')
        title('GO vs NOGO RT Anova')
        


        


Adapting it to your solution it now reads as:

figure
hold
subplot(1,3,1)
hold
group = [ones(size(M_GO)); ones(size(M_NOGO3))+1];
x = cat(1,M_GO,M_NOGO3);
boxplot(x,group), ...
       'labels';{'Go','No Go'};
        ylabel('Reaction Time(ms)')
        xlabel('GO vs NOGO')
        title('GO vs NOGO RT Anova')

%%%However, my labels still only show 1 and 2 %%%%



Could you help me to solve this minor problem, please? Thank you.


"Anon" wrote in message <h1fqmd$1e9$1@fred.mathworks.com>...
> Hi Valentina,
>
> try following:
> group = [ones(size(t1);ones(size(t2))+1;ones(size(t3))+2];
> x = cat(1,t1,t2,t3);
> boxplot(x,group);
>
> HTH
>
>
>
> "Valentina " <vrossett82@gmail.com> wrote in message <h1fme2$3nn$1@fred.mathworks.com>...
> > Hi,
> > I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?
> >
> > Thank you very much!
> >
> > Valentina

I hope you still have some use with this answer!

set(gca,'XTick',1:3,'XTickLabel',{'label1';'label2';'label3'})

"Aldo Amaya" <aamaya4@uic.edu> wrote in message <j2eso0$84p$1@newscl01ah.mathworks.com>...
> Hi HTH,
>
> The code worked great, however, it does not allowed me to add labels like before.
>
> My previous code was :
>
> figure
> hold
> subplot(1,3,1)
> boxplot([M_GO M_NOGO3], 'notch';'on';...
> 'labels';{'Go','No Go'})
> ylabel('Reaction Time(ms)')
> xlabel('GO vs NOGO')
> title('GO vs NOGO RT Anova')
>
>
>
>
>
>
> Adapting it to your solution it now reads as:
>
> figure
> hold
> subplot(1,3,1)
> hold
> group = [ones(size(M_GO)); ones(size(M_NOGO3))+1];
> x = cat(1,M_GO,M_NOGO3);
> boxplot(x,group), ...
> 'labels';{'Go','No Go'};
> ylabel('Reaction Time(ms)')
> xlabel('GO vs NOGO')
> title('GO vs NOGO RT Anova')
>
> %%%However, my labels still only show 1 and 2 %%%%
>
>
>
> Could you help me to solve this minor problem, please? Thank you.
>
>
> "Anon" wrote in message <h1fqmd$1e9$1@fred.mathworks.com>...
> > Hi Valentina,
> >
> > try following:
> > group = [ones(size(t1);ones(size(t2))+1;ones(size(t3))+2];
> > x = cat(1,t1,t2,t3);
> > boxplot(x,group);
> >
> > HTH
> >
> >
> >
> > "Valentina " <vrossett82@gmail.com> wrote in message <h1fme2$3nn$1@fred.mathworks.com>...
> > > Hi,
> > > I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?
> > >
> > > Thank you very much!
> > >
> > > Valentina

Hi, I tried this and I had an error, for example:
x1 = [5 1 100 1];
x2 = [6 1 100 1 2 3];
group = [ones(size(x1));ones(size(x2))+1];
x = cat(1,x1,x2);
boxplot(x,group);

the error I get is
CAT arguments dimensions are not consistent.

Error in ==> ACCEPTEDRECOMMENDATIONSPERWEEKBOXPLOT at 56
group = [ones(size(x1));ones(size(x2))+1];

"Anon" wrote in message <h1fqmd$1e9$1@fred.mathworks.com>...
> Hi Valentina,
>
> try following:
> group = [ones(size(t1);ones(size(t2))+1;ones(size(t3))+2];
> x = cat(1,t1,t2,t3);
> boxplot(x,group);
>
> HTH
>
>
>
> "Valentina " <vrossett82@gmail.com> wrote in message <h1fme2$3nn$1@fred.mathworks.com>...
> > Hi,
> > I would like to create a box plot of my samples, but these samples have different sizes. I can combine all the samples in just one vector and then use grouping variables, but I don't understand how they work. so for example, if I have 3 samples t1,t2 and t3 of lengths 43,148,228 respectively, how would the function boxplot be filled in? Something like boxplot(cat(1,t1,t2,t3),....)?
> >
> > Thank you very much!
> >
> > Valentina

"Ruth " <pepito@yahoo.com> wrote in message
news:jrvooe$d4g$1@newscl01ah.mathworks.com...
> Hi, I tried this and I had an error, for example: x1 = [5 1 100 1];
> x2 = [6 1 100 1 2 3];
> group = [ones(size(x1));ones(size(x2))+1];
> x = cat(1,x1,x2);
> boxplot(x,group);
>
> the error I get is CAT arguments dimensions are not consistent.
>
> Error in ==> ACCEPTEDRECOMMENDATIONSPERWEEKBOXPLOT at 56
> group = [ones(size(x1));ones(size(x2))+1];

You're trying to stack a 1-by-4 vector of 1's on top of a 1-by-6 vector of
2's. MATLAB matrices must be rectangular; you can't have one row with 4
columns and another with 6.

If you placed the 1-by-4 vector of 1's NEXT TO the 1-by-6 vector of 2's as
opposed to ON TOP OF it, the result would be a 1-by-10 vector whose first 4
elements were 1 and whose last 6 elements were 2. A 1-by-10 vector is
rectangular, and so that would work just fine.

group = [ones(size(x1)),ones(size(x2))+1];

A similar problem occurs on the line where you construct x, and the solution
is the same.

--
Steve Lord
slord@mathworks.com
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