erorr in for loop

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Lilya
Lilya 2016-5-2
评论： Lilya 2016-5-3
could you please help me to correct these small calculations
w=0:0.02:5;
for i=1:length(w)
a(i)=w.^4-12.*(w.^2);
b(i)=w.^8-144.*(w.^4);
c(i)=9.*(w.^6)+256.*(w.^2);
Real(i)= a(i)/(b(i)+c(i));
end
thank you

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采纳的回答

CS Researcher
CS Researcher 2016-5-2
.^ is for element wise operation. Use this:
w=0:0.02:5;
for i=1:length(w)
a(i)=w(i)^4-12*(w(i)^2);
b(i)=w(i)^8-144*(w(i)^4);
c(i)=9*(w(i)^6)+256*(w(i)^2);
Real(i)= a(i)/(b(i)+c(i));
end
Or better:
w=0:0.02:5;
a = w.^4-12.*(w.^2);
b = w.^8-144.*(w.^4);
c = 9.*(w.^6)+256.*(w.^2);
Real= a./(b+c);
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Lilya
Lilya 2016-5-2
编辑：Lilya 2016-5-2
Sorry for the mistake Finding the w value that makes the equation =1 (i.e Real)

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更多回答（1 个）

Image Analyst
Image Analyst 2016-5-2
Try this:
w=0:0.02:5;
a = w.^4-12.*(w.^2);
b = w.^8-144.*(w.^4);
c = 9.*(w.^6)+256.*(w.^2);
ratios = a ./ (b+c);
plot(w, ratios, 'b*-');
grid on;
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Find w where ratios == 1
differences = ratios-1;
[minDifference, indexOfMin] = min(differences)
% Plot a circle there
hold on;
plot(w(indexOfMin), ratios(indexOfMin), 'ro', 'MarkerSize', 15, 'LineWidth', 2);
message = sprintf('ratios is closest to 1 at index %d where ratios(%d) = %f',...
indexOfMin, indexOfMin, w(indexOfMin));
uiwait(helpdlg(message));

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