Problem with imagesc in GUI

Question

Antti 2013-11-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/105817-problem-with-imagesc-in-gui

评论： Antti 2013-11-12

Hello,

I have a GUI where I import thermal camera data from files and then plot it in the GUI. I have two types of files: xls-data and csv-data. Xls-data is working fine, but when using csv-data, my axes are not set correctly. For example, if the length of the data is 43.2 meters, in GUI the length of x-axis is only 43 meters. And same problem with the y-axis. Any idea how to handle axes properties? The problem is not because of the datatypes (xls,csv, etc.) as I have tried to import data in several ways. However, the problem seems to be related with handling the axes properties of a GUI.

function import_button_Callback(hObject, eventdata, handles)
if handles.datatype == 1
   data = dlmread(file, '\t',11,0);
else
    data =  xlsread(file, -1);
end
length_data = length(data(:,1))*2.5/100;  %Pixel-size is 0.025m
width_data = length(data(1,:))*2.5/100;   %Pixel-size is 0.025m
data(data<=80)=NaN; %temperature limit set to 80C
clims = [80 160];
gca =handles.image;
handles.image = imagesc(0:length_data, 0:width_data, data',clims);
colorbar;
guidata(hObject, handles);

I was also thinking to set labels manually ('XTickLabel' and 'YTickLabel'), but as I need to draw rectangle (using imrect) in the figure and show/get coordinates, that's not really helping.

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Answer 1

Image Analyst 2013-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/105817-problem-with-imagesc-in-gui#answer_114969

You can use xlim() to set the limits of the x axis to start and stop at whatever values you want rather than have it automatically decide.

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Antti 2013-11-12

Thanks for the quick answer, but I think I didn't express my problem very well.

Consider a situation, where you have a matrix with a size of 4000x320. Your pixel size is 0.025x0.025m. So, you have data with length of 100 meters and width of 8 meters.

My question is how do you plot the data into the figure so that x-axis goes from 0 to 100 and y-axis goes from 0 to 8m? If I set xlim [0 100] and ylim [0 8] that doesn't work.

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