```Date: Feb 3, 2013 11:04 AM
Author: dpb
Subject: Re: Problem using plots and loops

On 2/3/2013 1:06 AM, Ankita wrote:...> 1) In the first 2 if loops, I want to make sure that the ratio fits in a> given limit. Is there any better way of doing that?You could write things like Nmax=min(InputRatio,Limit) etc., but if it works as is, that's a nicety and since it's just a single set of values and is in an user input section the time isn't an issue...I'd let it go until got other things worked out and develop some more familiarity w/ Matlab and programming in general...> 2) When I execute> the program, only the fprintf in 2nd if loop is executed. Why is that?Would seem to be owing to the values you've selected -- altho it's possible you've written a set of conditions such that one branch can never be reached because the tests aren't possible--I didn't have time at the moment to read it that carefully, sorry...> 3) For the last for loop, I should be get 4 different curves for 4> values of N. Instead I get one curve (the curve is actually a set of> points. Not a continuous line. That too is my problem.)Compute the points in an array and then plot each line when you have a set of values for the curve instead of each point as it is calculated.> %NOSE AND MAIN WHEEL LOAD CALCULATION...> B=M_f+N_f;> if M_f/B<0.20>   if M_f/B>0.1>     Nmax=W*(M_f/B);>   else>     Nmax=W*0.15; %max static load per nose wheel>     fprintf('The M_f/B ratio ...>   end> end>> if M_a/B>0.05>   if M_a/B<0.1>     Nmin=W*(M_f/B);>   else>     Nmin=W*0.08; %min static load per nose wheel>     fprintf('The M_a/B ratio has ...>   end> end>...> %TOTAL STROKE CALCULATION> %hold on;> K=L/W;figureV=10:15;for N=1.5:0.5:3   S=(V.^2/2*9.81+S_t*(1-K-0.47*N))/(0.8*N-1+K);   plot(V,S);   hold onendAbove computes the S vector for each point in the V vector w/o a loop then plots it.You'll probably want to add a color value to the plot since the colors won't automagically cycle unless S is a column vector.  Or, you could create a 2D array and save the whole thing then plot since the sizes are quite small...V=[10:15]';S=zeros(length(V)),4);  % preallocatei=0;for N=1.5:0.5:3   i = i+1;              % array column index   S(:,i)=(V.^2/2*9.81+S_t*(1-K-0.47*N))/(0.8*N-1+K);endplot(V,S);And, of course, one could look atdoc meshgridto do the computation w/o any explicit loops at all...--
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