Question

I try to read a text files with 20×20 data into variable C, and attempt to plot a histogram on the left Y-axes, and a ecdf/ksdensity on the right X-axes.

Using textscan, the data is read into a 400×1 array. However, when I tried to call plotyy to plot histogram, the code belows return

Error using plot
Vectors must be the same lengths. 

Error in pt (line 11)
axes = plotyy(x,C{1},x,C{1});

I guess it is due to C{1}. But have no clue on how to resolve it. I am new to matlab, would anyone point out the correct way to perform the above operations?

fid = fopen('t1_error.txt','r');
C = textscan(fid, '%.3f');            
fclose(fid);

disp(C{1});

x = -1:7;    % <-- change to x = length(C{1});  then histogram is plotted.
axes = plotyy(x,C{1},x,C{1});
hold on
hist(axes(1), C{1}, x);
ylim(axes(1),'auto');
set(axes(1),'mode','auto');
hold off

Answer 1

The length of x does not equal the length of C{1}. Try x = 1:length(C{1}) or x = -1:8/length(C{1}):7.