Simple for/while loop question

Is there an easy way to loop this. The first argument of a() has to be looped but the second should stay the same.

text(a(1,5),a(1,6),'1');
rectangle('position', [a(1,5) a(1,6) 50 50]);

text(a(2,5),a(2,6),'2');
rectangle('position', [a(2,5) a(2,6) 30 30]);

text(a(3,5),a(3,6),'3');
rectangle('position', [a(3,5) a(3,6) 30 30]);

[Geoff Hayes]

Please clarify how the looping should handle the different size, 50x50 vs 30x30. Also, why is m used for the third rectangle (instead of a)?

[a s]

Hi sorry, the m should be an a, I've corrected my mistake. I wanted the sizes to vary for each rectangle (though this is not important it can stay the same)

[per isakson]

"Is there an easy way to loop this." &nbsp I guess no! Had it been only the indicies of a that varied, but now there is also the strings, '1','2',3', and the numbers, 50 50, 30 30, 30 30, to worry about. One may put all that varies into a cell or struct array and loop over it. However, that might not meet the requirement easy. I sometimes do that to increase the readability of the code.

[Star Strider]

Parenthetically, rather than drawing a rectangle around the text object (that seems to be what you’re doing), use an annotation object, specifically Create Text Box Annotation.

[per isakson]

Is this another example of a XyProblem? Is it about the for-loop in Matlab or about numbers in boxes?

Answer 1

[Image Analyst]

Try this:

% Create sample x,y coordinates and rectangle sizes
a = 70*rand(3,6)
rectSizes = [50,30,30];
% Plot them.
for k = 1 : length(rectSizes)
  % Create a string to annotate with.
  message = sprintf('%s', k+'0')
  text(a(k,5),a(1,6), message, 'FontSize', 18, 'Color', 'b');
  % Place the rectangle.
  rectangle('Position', [a(k,5) a(k,6) rectSizes(k), rectSizes(k)], 'EdgeColor', 'r', 'LineWidth', 2);
end
grid on;