App designer - using a single variable to return multiple indices

Hi folks,

I am trying to pass two indices into a function but am currently failing as I'm sure I'm doing it wrong.

I tried to do this by defining an array, positionVector, which contains the indices I want to pass in pairs of 2, then using an iterator to pass these arguments to the function.

Is there a better way of doing this without hardcoding the positions?

Thanks

function ROI(app, index1, index2)
            hold (app.Image, "on")
            plot(app.Image, index1, index2, app.innerMarkerStyle, 'MarkerSize', app.CrosshairThickness.Value, 'Color', app.crossHairColour); 
            plot(app.Image, index1, index2, app.outerMarkerStyle, 'MarkerSize', app.CrosshairThickness.Value, 'Color', app.crossHairColour);                                
end              
function DisplayCrosshairs(app)
    I = imshow(app.currentImage, "Parent", app.Image); 
    app.Image.XLim = [0 I.XData(2)];
    app.Image.YLim = [0 I.YData(2)];
    
    app.Width = app.Image.XLim;
    app.Height = app.Image.YLim; 

    quarterHeight = app.Height(1)+range(app.Height)*0.25;
    halfHeight = app.Height(1)+range(app.Height)*0.5;
    threeQuarterHeight = app.Height(1)+range(app.Height)*0.75;
    quarterWidth = app.Width(1)+range(app.Width)*0.25;
    halfWidth = app.Width(1)+range(app.Width)*0.5;
    threeQuarterWidth = app.Width(1)+range(app.Width)*0.75;
    
    positionVector = {quarterHeight quarterWidth; quarterHeight halfWidth; quarterHeight threeQuarterWidth; halfHeight quarterWidth; halfHeight halfWidth; halfHeight threeQuarterWidth; threeQuarterHeight quarterWidth; threeQuarterHeight halfWidth; threeQuarterHeight threeQuarterWidth};
    checkMatrix = [app.TopLeft.Value app.TopMiddle.Value app.TopRight.Value app.CentreLeft.Value app.CentreMiddle.Value app.CentreRight.Value app.BottomLeft.Value app.BottomMiddle.Value app.BottomRight.Value];
    app.numSamplesPerImage = sum(checkMatrix, 1:9);   
    
    for i = 1 : 9
        if checkMatrix(i) == 1
            ROI(app, positionVector{i});
        end
    end
end

Answer 1

[Mohammad Sami]

Change it as follows

ROI(app, positionVector{i,:}); %row i, all columns