I want to calculate Re for each diameter value but I get this error ''unable to perform assignment because the left and right sides have a different number of elements.''.how can I fix this ? Sorry, Im beginner in matlab.

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hüsna özlem mermer 2021-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/831563-i-want-to-calculate-re-for-each-diameter-value-but-i-get-this-error-unable-to-perform-assignment-b

回答： Image Analyst 2021-5-16

clear all clc

L=(2000+(5*50))

T=5+5*0.25

It=0.0075*L

ht=0.15*T

bt=0.50*It

e=0.0003*(5+50)

t=15000/sqrt(9.81/ht)

V=It*ht*bt

flwrt=V/t

D=0.1:0.01:0.5;

B=D'

iteration=1;

for D=0.1:0.01:0.5

v(iteration)=((4*flwrt)/(pi*D))

Re(iteration)=((v*D)/0.00000131)

iteration=iteration+1;

end

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Answer 1

Image Analyst 2021-5-16

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Lots of errors in your code. Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 18;
L=(2000+(5*50))
T=5+5*0.25
It=0.0075*L
ht=0.15*T
bt=0.50*It
e=0.0003*(5+50)
t=15000/sqrt(9.81/ht)
V=It*ht*bt
flwrt=V/t
D=0.1:0.01:0.5;
B=D'
for iteration = 1 : length(D)
	thisD = D(iteration);
	v(iteration) = (4*flwrt) / (pi*thisD)
	Re(iteration) = (iteration * thisD) / 0.00000131;
end
plot(Re, 'b-', 'LineWidth', 2);
grid on
xlabel('Iteration', 'FontSize', fontSize);
ylabel('Re', 'FontSize', fontSize);
fprintf('Done running %s.m ...\n', mfilename);
% End of main script.