Plotting 2d data

6 次查看（过去 30 天）
darkphotonix
darkphotonix 2019-4-21
评论： Walter Roberson 2019-4-21
Haven't touched Matlab in over two years, trying to create a graph plotting my answers. I'm getting an error "Index exceeds the number of array elements (1)."
%loop for thickness
for i = 3 : 1 : 10
%loop for number of fins
for j = 8 : 1 : 12
m(i) = sqrt((2*ho)/(k*t(i)/1000)); % m^-1
At(i,j) = fins(j)*Af+((2*pi*r2)-(fins(j)*t(i)/1000)); %m
n_o(i,j) = 1-(((fins(j)*Af)/At(i,j))*(1-(tanh(m(i)*(r3-r2))/(m(i)*(r3-r2)))));
R_to(i,j) = 1/(n_o(i,j)*ho*At(i,j)); % m*K/W
R_t(i,j) = R_conv + R_cond +R_to(i,j); % m*K/W
q(i,j) = (delta_T)/(R_t(i,j)); % W/m
plot(j,q(i,j),'b-',linewidth',2);
hold on
end
end
plot(fins,q,'r.','markersize',20,'linewidth',2);
set(gca,'fontsize',16,'fontweight','bold')
title('Heat Rate increase as fins and thickness increases');
xlabel('Number of Fins','fontsize',16);
ylabel('Heat Rate (W)','fontsize',16);

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2019-4-21
t = 0.003 is a scalar, but you index t(i)
Caution: your i and j are scalars, so plot(j, q(i,j), 'b-') is going to try to plot a single point. plot() only ever draws a line you pass it two adjacent finite values in a single call. Your plot() call is not going to plot anything. If you were to alter the 'b-' to 'b*-' then it would at least place markers at the single points that it draws.
  3 个评论
显示 1更早的评论
darkphotonix
darkphotonix 2019-4-21
Gotcha, I completey spaced on that. How would I then seperate the plot points for each thickness on a graph
Walter Roberson
Walter Roberson 2019-4-21
Parts of the code have mysteriously vanished and due to an allergy flare I don't seem to have successfully memorized it before it changed.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by