Displaying an axis scale in mm rather than pixels

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Robbie McDermott 2017-11-1

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评论： elvis okacha 2019-4-13

I have written a code for image analysis that uses the number of pixels throughout to calculate lengths. Now I want to plot graphs and have my axis reading in millimetres rather than number of pixels. I have a calibration factor calculated, is there a simple way I can have axis in millimetres. I need this code to work for multiple pictures therefore using the xticks and xticklabels method would help.

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Looky 2017-11-1

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编辑：Looky 2017-11-1

在 MATLAB Online 中打开

It's a bit tricky without any example data, but this should do the trick.

    conversion=0.1; % in mm/pixel
    addMM=@(x) sprintf('%.3fmm',x*conversion);
    xticklabels(cellfun(addMM,num2cell(xticks'),'UniformOutput',false));
    yticklabels(cellfun(addMM,num2cell(yticks'),'UniformOutput',false));

You can fine tune how many digits are displayed by editing the '%.3fmm' in the second line(see formatSpec). Change the variable conversion to your needs. It's in mm per pixel. Hope that helps, if not, just ask. Note that Matlab still treats the axis in Pixel, but displays the converted mm. If you make changes to xtick and ytick, you have to call the above lines again.

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Robbie McDermott 2017-11-2

That is fantastic, does exactly what I wanted it to! Thank you, saved me two week work!

Stelios Fanourakis 2019-1-9

It is a very nice solution, indeed. Thanks a lot as well. I'd like to ask whether there is a way to have more steps, like every 50 mm or every 10 mm, instead of almost a 100 mm

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elvis okacha 2019-4-10

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Look I'm trying to implement your solution within a button program in my guitar,but I still get error that 'undefined variable 'xticks''.allitle new to Matias.is there some additional code on the use of stick and xticklabels?kindly