How to add zero at the very beginning of my column matrix?

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Robert Flores
Robert Flores 2019-4-18
编辑： Adam Danz 2019-4-18
Hello everyone,
I am plotting a stress-strain curve and would like to insert a point at the origin. I have tried using the zeros function but have not found any luck yet. I keep getting an error stating that the "dimensions of arrays being concatenated are not consistent". If you can please help me resolve this issue, it'll be greatly appreciated, thanks in advance.
CODE:
%% Stress & Strain Curve from Force Actuator
exist('DIC_test.08.02.xlsx','file');
Data = importdata('DIC_test.08.02.xlsx');
Time = Data(:,1); Force = Data(:,2); Displacement = Data(:,3);
Area = (6.26e-3)*(1.57e-3); Lo = 27.07;
Eng_Stress = Force/Area;
Eng_Stress(Eng_Stress < 0) = NaN;
Eng_Stress = Eng_Stress(327:end);
Eng_Stress = [zeros(1), Eng_Stress]; % This is the column I am trying to add a zero at the very beginning
Eng_Strain = (Displacement)/Lo;
Eng_Strain = Eng_Strain - Eng_Strain(327);
Eng_Strain = Eng_Strain(327:end);
Eng_Strain = zeros(1) + Eng_Strain; % This one I think is okay
Percent_Elongation = (Displacement(end)/Lo)*100;
E_FA = ((Eng_Stress(600)-Eng_Stress(500))/(Eng_Strain(600)-Eng_Strain(500)))/(1e9)
figure(1)
plot(Eng_Strain,Eng_Stress,'r')
ytickformat('%12.2f')
ax = gca;
ax.YAxis.Exponent = 6;
hold on
plot(Eng_Strain(500),Eng_Stress(500),'b *')
plot(Eng_Strain(600),Eng_Stress(600),'b *')
grid on
title('Stress v. Strain Force Actuator'); xlabel('Strain Measured in mm/mm'); ylabel('Stress measured in Pa')

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采纳的回答

Adam Danz
Adam Danz 2019-4-18
编辑：Adam Danz 2019-4-18
Use a semicolon instead of a comma. The variable 'Eng_Strain' is a column vector so you need to vertically concatenate the zero with the vector.
Eng_Stress = [zeros(1); Eng_Stress];
% ^
Or just
Eng_Stress = [0; Eng_Stress];

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