How to export data from a for loop without overwriting the data?

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Julia Morandi
Julia Morandi 2018-7-24
评论： Julia Morandi 2018-7-24
I want to create a table with all of the x, y, and z coordinates and additionally all of the x2,y2,and z2 coordinates. Does anyone know how to do this so that the values don't overwrite within each for loop? My code is below...
clc;
clear variables;
close all;
n = input('number of revolutions ');
r = input('radius of stent ');
a = input('angle with respect to the upwards horizontal in degrees ');
w = input('number of wires ');
R = input('radius of wire ');
h=(2*n*pi*r)/tand(90-a); %height of stent determined by other inputs
e = (2*pi)/(w/2); %theta (spacing between where each wire starts)
if mod(w,2) ==0 %number of wires is even
else
fprintf('ERROR:number of wires must be even'); %stops code if wire number is odd
return
end
if mod(n,1) ==0 %number of revolutions is whole number
else
fprintf('ERROR:number of revolutions must be whole number');
return
end
for i=1:w/2
d=1;
for t=(i-1)*e:2*pi/w:(n*2*pi)+e*(i-1)
d=d+1;
if mod(d,2)==0
x=(r+R)*sin(t);
y=(r+R)*cos(t);
z=(h/(n*2*pi))*(t-((i-1)*e));
plot3(x,y,z,'.','MarkerSize',25,'MarkerFaceColor','black','MarkerEdgeColor','black')
hold on
else
x=(r-R)*sin(t);
y=(r-R)*cos(t);
z=(h/(n*2*pi))*(t-((i-1)*e));
plot3(x,y,z,'.','MarkerSize',25,'MarkerFaceColor','black','MarkerEdgeColor','black')
hold on
end
hold on
end
hold on
end
for i=1:w/2
k=1;
for t2=(n*2*pi)+(e*(i-1)):-2*pi/w:(i-1)*e
k=k+1;
if mod(k,2)==0
x2=(r-R)*sin(t2);
y2=(r-R)*cos(t2);
z2=(h/(n*2*pi))*(t2-((i-1)*e));
plot3(x2,y2,z2,'.','MarkerSize',25,'MarkerFaceColor','red','MarkerEdgeColor','red')
hold on
else
x2=(r+R)*sin(t2);
y2=(r+R)*cos(t2);
z2=(h/(n*2*pi))*(t2-((i-1)*e));
plot3(x2,y2,z2,'.','MarkerSize',25,'MarkerFaceColor','red','MarkerEdgeColor','red')
hold on
end
hold on
end
hold on
end

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回答（1 个）

jonas
jonas 2018-7-24
You need to save the next entry as a new index:
out(ind)=1;
If you have steadily increasing i, then you can just write
for i=1:2
out(i)=1;
end
If you are looping over something less convenient, you can use a counter
counter=1;
for i=1.5:0.5:2.5
out(counter)=1;
counter=counter+1;
end

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