How to find the closest values (positive and negative) to the line when X is zero?

Question

Valentin Augusto Simbron Mckay 2023-1-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1901455-how-to-find-the-closest-values-positive-and-negative-to-the-line-when-x-is-zero

评论： Valentin Augusto Simbron Mckay 2023-1-26

采纳的回答： Matt J

Data.mat

在 MATLAB Online 中打开

Hi,

I am trying to find the closest two points (positive and negative) when x is zero, I tried with interp1 and find but it didn't work.

Something similar like the image.

This is my code

Thanks for the help

%Data 
load Data
%Create line plot 
x = V;
y = J; 
%plot(x,y,'b-','LineWidth',5);
plot(x,y,'-o','MarkerIndices',1:19:length(y))
hold on
%Label the axes and add a title 
xlabel('Voltage V')
ylabel('density current mA/cm2')
title('J-V curve ')
% Set axis start from origin 
axis([-0.06 0.7 -0.001 0.008])
%yDesired = interp1(x,y,0);
%Minimum x value for positive y 
%Y line 
x1 = [0 0];
y1 = [0 0.1];
line(x1,y1,'Color','red','LineStyle','--')
%X line 
x2 = [0 0.7];
y2 = [0 0];
line(x2,y2,'Color','red','LineStyle','--')
%find the value when x=0
y=interp1(x,y,0)