Trying to find the corresponding value of a matrix with an input?

Question

rman 2022-7-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/1755315-trying-to-find-the-corresponding-value-of-a-matrix-with-an-input

编辑： Karim 2022-7-7

VelocityAgainstRodHeight500Hz.fig

I have a Matrix of values (A). In the first column, it conttains the length of the rods and in the second column it contains the velocity. I want to find a script / code that allows me to input a velocity value and then find the corresponding rod height.

However, one issue is that the velocity values are not exact numbers. For example, one velocity value is 2.8757e3 . Therefore, I would need the script to interpolate the input value and find the interpolated rod height. But I have an array of velocity value that i need to find the corresponding rod heights for. Is there a way to do this?

I will attach my code and my figures.

%% height(x,y)
% Calculate the height here --> fig 1(e)
% Interpolate the velocity with the rod height
fig = openfig('VelocityAgainstRodHeight500Hz.fig');
axObjs = fig.Children;
dataObjs = axObjs.Children;
rod_heights = dataObjs(1).XData;
velocities = dataObjs(1).YData;
A = [];
A(:,1)=rod_heights;
A(:,2)=velocities;