Hi Nayef,
It is my understanding that you have a time series dataset where each datapoint corresponds to some wind magnitude, additionally you have an array representing the wind direction at these datapoints. You want to know an alternate way than using the traditional “quiver” function to represent wind direction using arrows at these plotted data points.
Here’s a possible workaround for your reference-
Hi Nayef,
It is my understanding that you have a time series dataset where each datapoint corresponds to some wind magnitude, additionally you have an array representing the wind direction at these datapoints. You want to know an alternate way than using the traditional “quiver” function to represent wind direction using arrows at these plotted data points.
Here’s a possible workaround for your reference-
% Generating random data
time = 1:10;
magnitude = [3 6 4 8 5 7 6 9 4 7];
direction = [30 45 60 75 90 105 120 135 150 165]; %in degrees
% Plotting magnitude
plot(time, magnitude, 'b', 'LineWidth', 2);
hold on;
% Add arrows indicating the direction
arrowLength = max(magnitude) * 0.05;
arrowX = time;
arrowY = magnitude;
arrowAngle = deg2rad(direction);
arrowXEnd = arrowX + arrowLength * cos(arrowAngle);
arrowYEnd = arrowY + arrowLength * sin(arrowAngle);
for i = 1:numel(time)
drawArrow([arrowX(i), arrowY(i)], [arrowXEnd(i), arrowYEnd(i)], 'r', 0.08, 25);
end
% Custom function to draw an arrow
function drawArrow(startPoint, endPoint, color, lineWidth, tipAngle)
% Calculate arrowhead points
arrowLength = norm(endPoint - startPoint);
arrowHeadLength = arrowLength * tan(deg2rad(tipAngle));
arrowHeadWidth = arrowHeadLength / 2;
arrowHeadPoints = [0, arrowHeadWidth; arrowHeadLength, 0; 0, -arrowHeadWidth];
% Rotate and translate arrowhead points
theta = atan2(endPoint(2) - startPoint(2), endPoint(1) - startPoint(1));
R = [cos(theta), -sin(theta); sin(theta), cos(theta)];
arrowHeadPoints = (R * arrowHeadPoints')';
arrowHeadPoints = arrowHeadPoints + endPoint;
% Draw arrow
line([startPoint(1), endPoint(1)], [startPoint(2), endPoint(2)], 'Color', color, 'LineWidth', lineWidth);
patch(arrowHeadPoints(:, 1), arrowHeadPoints(:, 2), color, 'EdgeColor', color, 'LineWidth', lineWidth);
end
Regards
Vinayak Luha
