MATLAB Answers

multiple scatter plot

45 views (last 30 days)
Hassan
Hassan on 23 Apr 2011
I have 4 arrays, A,B,C,D which their size is 80 rows, 4 columns. I want to make a scatter plot between the same column of each two arrays e.g. X=A(:,1),Y=B(:,1) or X=C(:,4), Y=D(:,4). I have a cell array s={s1;s2,...;s16} which s1 is lable for A(:,1), if X=A(:,1) then the lable for x axis is s1 and if Y=A(:,1)then the lable for y axis is s1. I also want to add the regression equation and r-squared value. I used the following code but it's not working. ANy help is appericiated.
s={s1;s2;s3;s4;s5;s6;s7;s8;s9;s10;s11;s12;s13;s14;s15;s16}
% to draw a 1:1 line
fignum = 1;
for i=1:4
while ishandle(fignum)
fignum = fignum + 1;
end
figure(fignum);
X=A(:,i)
Y=C(:,i)
R=corrcoef(X,Y);
R_squared=R(2)^2;
R_squared=R_squared*100
R_squared=round(R_squared)
scatter(X,Y);
%Add least-squares line to scatter plot
h=lsline;
set(h,'color','r');
%Use polyfit to compute a linear regression that predicts y from x
p = polyfit(X,Y,1)
p =spa_sf(p,2)
max_x=max(X);
max_y=max(Y);
min_x=min(X)
min_y=min(Y)
mean_x=mean(X)
mean_y=mean(Y)
if (max_x > max_y)
max_value=max_x;
else
max_value=max_y;
end;
if X==A(:,i)
label_x=s(i);
else if X==B(:,i)
label_x=s(i+4);
else if X==C(:,i)
label_x=s(i+8);
else if X==D(:,i)
label_x=s(i+12);
end
if Y==A(:,i)
label_y=s(i);
else if Y==B(:,i)
label_y=s(i+4);
else if Y==C(:,i)
label_y=s(i+8);
else if Y==D(:,i)
label_y=s(i+12);
end
xlabel(label_x); ylabel(label_y);
xlim([0 max_value+max_value/20]);
ylim([0 max_value+max_value/20]);
line([0,max_value+max_value/20],[0,max_value+max_value/20],... 'linewidth',1,... 'color',[0,0,0]);
text(mean_x-mean_x/1.1, max_y-(max_y/4), ['R^2 (%) = ' num2str(R_squared)])
text(mean_x-mean_x/1.1, max_y-(max_y/4)-(max_y/10), ['Y = ' num2str(p(1))])
text(mean_x-mean_x/1.1+max_x/8, max_y-(max_y/4)-(max_y/10), [' X + ' num2str(p(2))])
end
  2 Comments
Hassan
Hassan on 23 Apr 2011
it's working fine now, it seems the problem was about 'else if' which should be 'elseif'. thanks Oleg.

Sign in to comment.

Answers (1)

Oleg Komarov
Oleg Komarov on 23 Apr 2011
As an indication give a look at plotmatrix
  2 Comments
Hassan
Hassan on 23 Apr 2011
A(:,1) and B(:,1)
A(:,2) and B(:,2)
A(:,3) and B(:,3)
A(:,4) and B(:,4)

Sign in to comment.

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!