want to display the x value of the maximum in my graph?

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Rehanos_boyzee 2021-6-12

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评论： Adam Danz 2021-6-13

for the code below i want to display the maximum value of x on the graph can anyone please let me know thanks?

[GC,GR]=groupcounts (VarName8); % taking values from the excel sheet 
area=table(GC, GR); % all areas with the number of trips to each have been totaled in this table in random order
sorted_area=sortrows(area,-1); % sorting the area and number of trips in a descending order
[Highest,index]=max(GC);
plot(GR,GC,'Linewidth',1.2,'color','b'); xlabel('Area Number'); ylabel('Total Trips');
grid on
hold on
plot(GR(index),GC(index),'r*'); text(GR(index),GC(index),'\leftarrow Maximum')

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Adam Danz 2021-6-12

is VarName8 a column of data?

Rehanos_boyzee 2021-6-12

Yes Var 8 is column of data that I'm taking importing from an excel sheet

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Answer 1

Image Analyst 2021-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/854720-want-to-display-the-x-value-of-the-maximum-in-my-graph#answer_723825

在 MATLAB Online 中打开

Try this:

x=[1 2 3 4 5 6];
y=[5 6 7 6 5 4];
[highest,index] = max(y)
plot(x,y); text(x(index), y(index), '\leftarrow')
ylim([4, 8]);
grid on;
caption = sprintf('   maximum point at (x,y) = (%.1f, %.1f)', x(index), highest);
text(x(index), y(index), caption, 'FontSize', 12, 'Color', 'r', 'FontWeight', 'bold');