troubles with trapz function

hello

I Have a matrix that i have plotted on Matlab (it is the xls file attached). I need to find the area of the graph based on that data. I am using trapz function but it turns back with an error. Any help with that would be more than appreciated.

Kind regards

[Christos Papagrigoriou]

Error using trapz (line 64)

Subscripting a table using linear indexing (one subscript) or multidimensional indexing (three or more subscripts) is not

supported. Use a row subscript and a variable subscript.

Error in stressplatform1 (line 42)

impulsemomentsquat1= trapz(x,y);

this is the exact eeror displayed. Would it be too much of a bother if I d ask to see what you did?

Cheers

Answer 1

[Star Strider]

We likely took the same approach. There are several ways to access the data in table objects, as described in the documentation.

Try this:

T1 = readtable('stressplatformexp.xlsx');
x = T1{:,1};
y = T1{:,2};
A = trapz(x, y);

figure
patch([x; flipud(x)],  [y; zeros(size(y))], 'g', 'FaceAlpha',0.5)
grid
text(6, 140, sprintf('Area = %.3f',A), 'HorizontalAlignment','center')

[Christos Papagrigoriou]

u saved my degree luv ya

[Star Strider]

Thank you!

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