How to multiply 2 columns by a scalar number in MATLAB

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Muhammad
Muhammad on 19 Sep 2013
Dear All
Hope you all are keeping good.i need 4 columns [X,Y,Z,Volume]in excel and first of all i want to multiply X and Y columns by 0.09 and (Z column contains just one scalar (0.18) value) then want to multiply all these X,Y,Z coordinates to get Volume. the code i am trying is given below. any help is appreciated.
if true
[x, y] = find(handles.maskedImage ~= 0);
% here x and y are created in excel by code line.to calculate the volume. first multiply 0.09 by both columns to get X and Y.
X=times(0.09,x);
Y=times(0.09,y);
Z = repmat(0.18,[length(x),1]);
[FileName,PathName] = uiputfile('*.xls','Save data to spreadsheet');
Volume=times(X,Y,Z);
Data=[X,Y,Z, Volume];
xlswrite([PathName '/' FileName],Data); end
  3 Comments
Image Analyst
Image Analyst on 19 Sep 2013
No it doesn't. Think about what you are doing. Multiplying the x,y coordinates of every pixel in the selected region by the spatial calibration factor does not calculate the volume.

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Accepted Answer

Jan
Jan on 19 Sep 2013
X = 0.09 * x;
Y = 0.09 * y;
Volume = X .* Y * 0.18;
  3 Comments
Muhammad
Muhammad on 24 Sep 2013
ok yes, i understand. listen what i want.
i want to make GUI it will work as we contour some region of interest in the patient CT in Pinnacle treatment planning system and then calculate the dose and find mean,minimum, maximum dose in that region.
But i have a image file and a dose file. i want to use these to calculate the maximum, minimum, and mean doses inside the contour region.i want to make contoure in the image and use that in dose to find the dose in that region and calculate maximum, minimum, and mean dose in that region.
till now, i made a GUI i can open a image (there are 55 image Slices, i can open one at a time) on the axis then i can contour by imfreehand. i thoght if i have the all x,y cooridnates inside the region then i will find these coordinate in the dose file which is in excel for the same slice to calculate the mean maximum doses but it vain

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