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Why is my "plot" function not working?

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William
William 2023-3-26
评论： Star Strider 2023-3-26
T = readtable('ELG3155_LAB3_part2_M_2V.xlsx', 'PreserveVariableNames', true);
x = T.("Time (ms)");
y = T.("Raw speed (mrad/s)");
grid on;
plot(x,y);
When i run this it says there is an error with my plot function, why?
  2 个评论
Matt J
Matt J 2023-3-26
We can't run the code (because it's an image and because the data hasn't been provided)

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采纳的回答

Star Strider
Star Strider 2023-3-26
编辑：Star Strider 2023-3-26
Ran in:
Use the str2double function on the last four variables.
EDIT — (26 Mar 2023 at 10:28)
T = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1336464/ELG3155_LAB3_part2_M_2V.xlsx', 'VariableNamingRule','preserve');
VN = T.Properties.VariableNames;
x = T.("Time (ms)");
y = str2double(T.("Raw speed (mrad/s)"));
figure
plot(x,y)
xlabel(VN{1})
ylabel(VN{3})
grid on
.

更多回答（1 个）

Walter Roberson
Walter Roberson 2023-3-26
The first row has time 00. That is text not numeric.
Looking at the left justification it looks to me as if the second column is text rather than numeric.
  1 个评论
Walter Roberson
Walter Roberson 2023-3-26
I checked in Excel itself, and sure enough, the 00 gives a warning about "Number stored as text", and all of columns 2, 3, 4 report the same thing.
If you use readmatrix() then everything will be converted to numeric.
Note: with default options, the 00 0 0 0 row will be detected as being header and will be skipped.

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