dot Indexing is not supported for variables of this type error on a scatterplot

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Henry
Henry 2025-2-14
评论： Walter Roberson 2025-2-14
Im new to Matlab and cnat figure out what is wrong with this code, I literally copied someones code down word for word, I keep getting the arror but they dont. if I comment out the scatter_2 and everything below it the code works but once I add it back in the error shows up. I dont get why I can use dot indexind on the first section but not on the second.
% Step 8: Scatter plot for the correlation between Beam Length and Yield Strength
scatter(beam_data.Length, beam_data.YieldStrength, 100, "b.")
xlabel('Beam Length (Meters)')
ylabel('Yield Strength (Newtons')
title('Beam Length and Strength Correlation')
hold on
scatter_2 = scatter(total_over_stressed_beam.Length, total_over_stressed_beam.YieldStrength, 10, "red", 'filled')
legend(scatter_2, 'Overstressed')
hold off
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Henry
Henry 2025-2-14
Step 8: Scatter plot for the correlation between Beam Length and Yield Strength
scatter(beam_data.Length, beam_data.YieldStrength, 100, "b.")
xlabel('Beam Length (Meters)')
ylabel('Yield Strength (Newtons')
title('Beam Length and Strength Correlation')
hold on
scatter_2 =scatter(over_stressed_beam_total.Length, over_stressed_beam_total.YieldStrength, 10, "red", 'filled')
legend(scatter_2, 'Overstressed')
hold off
Dot indexing is not supported for variables of this type.
Walter Roberson
Walter Roberson 2025-2-14

over_stressed_beam_total is a double, not a struct or table. You cannot use dot indexing on a double. You need to figure out how it got to be a double instead of a struct or table

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回答（1 个）

BhaTTa
BhaTTa 2025-2-14
编辑：BhaTTa 2025-2-14
Hey @Henry, I understand that you are facing error in scatter_2 plot, specifically with using dot indexing on total_over_stressed_beam, follow the below steps to troubleshoot the issue:
  1. Ensure that total_over_stressed_beam is defined before you attempt to use it. It should be a structure or table with fields Length and YieldStrength.
  2. Double-check the spelling of total_over_stressed_beam and its fields. MATLAB is case-sensitive, so any mismatch will lead to errors.
  3. You can verify that total_over_stressed_beam is indeed a structure or table by using the whos command or class function.

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