Plot matrix with imagesc

I have a question concerning the plot with imagesc. I have a variable a which is a struct, made of data and the first line of letters (each letter denotes a column), as shown in the figure on the left.

To plot this, I extract the data from the struct a (dat=a.data) and I use the function imagesc (imagesc(dat)), obtaining the figure on the rigth.

I would like to add the letters as shown in the figure (A,B,C), in order to label the data. These letters should be read directly from the line of the .txt file.

How can I do this?

Answer 1

[Mehmed Saad]

• Use text scan to read from text file
• Use text to write text on figure

no_of_word_to_read = 3; %no of columns
filename = 'C:\Users\XX PC\Desktop\x.txt'; % your own file name with path 
fileID = fopen(filename,'r');%open txt file
varn = textscan(fileID,'%s',no_of_word_to_read);%read text from it
fclose(fileID);% close txt file 
v = figure;
imagesc(dat)
mina= min(v.Children.YLim)%get the axis limit 
for i = 1:no_of_word_to_read
text(i,mina-0.1,varn{1}{i},'FontSize',15);
end

[aurc89]

It gives error in line

mina= min(v.Children.XLim)

Maybe it's due to my Matlab version (R2014a) ?

[Mehmed Saad]

mina= min(ylim)

[aurc89]

It works! Thanks!