App designer - using a single variable to return multiple indices

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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?
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);
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});

Accepted Answer

Mohammad Sami
Mohammad Sami on 31 Mar 2021
Edited: Mohammad Sami on 31 Mar 2021
Change it as follows
ROI(app, positionVector{i,:}); %row i, all columns

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