Blank figures using plot

Question

Ivaylo Ivanov 2020-1-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/501009-blank-figures-using-plot

评论： Ivaylo Ivanov 2020-1-20

采纳的回答： Image Analyst

在 MATLAB Online 中打开

I am running the following code and when the figures pop-up, they are blank without any lines.

I have tried running the Matlab in the software mode, thinking that the problem is in the OpenGL, but nothing changed.

So the error must be in the code , but I cannot figure out where. I appreacate any help on this, as I am stuck..

c1=3.74*10^8;
c2=1.44*10^4;
T1=30;
T2=90;
T3=120;
a1=0;
a2=0;
a3=0;
max1=0;
max2=0;
max3=0;
figure(1);
for a=0:0.01:300
M=c1/((a^5)*(exp(c2/(a*T1))-1));
plot(a,M,'b')
if M>max3
max3=M; a3=a;
end
hold on
end
figure(2);
for a=0:0.01:80
M=c1/((a^5)*(exp(c2/(a*T2))-1));
plot(a,M,'r')
if M>max2
max2=M; a2=a;
end
hold on
end
figure(3);
for a=0:0.01:80
M=c1/((a^5)*(exp(c2/(a*T3))-1));
plot(a,M,'g')
if M>max1
max1=M; a1=a;
end
hold on
end

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Answer 1

Image Analyst 2020-1-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/501009-blank-figures-using-plot#answer_410930

在 MATLAB Online 中打开

Try this:

clc
clear all
close all
c1 = 3.74*10^8;
c2 = 1.44*10^4;
T1 = 30;
T2 = 90;
T3 = 120;
a1 = 0;
a2 = 0;
a3 = 0;
max1 = 0;
max2 = 0;
max3 = 0;
subplot(1, 3, 1);
a = 0:0.01:300;
M = zeros(1, length(a));
fprintf('Starting loop #1 to compute %d values.\n', length(a));
for k = 1 : length(a)
	M(k) = c1/((a(k)^5)*(exp(c2/(a(k)*T1))-1));
	if M(k)>max3
		max3 = M(k);
		a3 = a;
	end
	hold on
end
plot(a, M, 'b-', 'LineWidth', 2)
grid on;
xlabel('a', 'FontSize', 15);
ylabel('M', 'FontSize', 15);
drawnow;
subplot(1, 3, 2);
a = 0:0.01:80;
M = zeros(1, length(a));
fprintf('Starting loop #2 to compute %d values.\n', length(a));
for k = 1 : length(a)
	M(k) = c1/((a(k)^5)*(exp(c2/(a(k)*T2))-1));
	if M(k) > max2
		max2 = M(k);
		a2 = a;
	end
	hold on
end
plot(a, M, 'r-', 'LineWidth', 2)
grid on;
xlabel('a', 'FontSize', 15);
ylabel('M', 'FontSize', 15);
drawnow;
subplot(1, 3, 3);
a = 0:0.01:80;
M = zeros(1, length(a));
fprintf('Starting loop #3 to compute %d values.\n', length(a));
for k = 1 : length(a)
	M(k) = c1/((a(k)^5)*(exp(c2/(a(k)*T3))-1));
	if M(k) > max1
		max1 = M(k);
		a1 = a;
	end
	hold on
end
darkGreen = [0, 0.5, 0];
plot(a, M, 'g', 'Color', darkGreen, 'LineWidth', 2)
grid on;
xlabel('a', 'FontSize', 15);
ylabel('M', 'FontSize', 15);