My matlab plot is not showing up anymore

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Ellinor
Ellinor 2025-4-14
编辑： William 2025-9-11，12:32
Hi. I am plotting a graph, more specifically, the intensity of light against the points on a screen (a physics experiment). At first, my plot showed up with no problem, but after a while, my plot suddenly stopped showing up. There are no error numbers. Where my plot should be is now simply a grey, empty space. I searched for solutions and saw that people have had this problem before, but none of the solutions suggested have worked for me. Would anyone know why my plot is not showing up?
Here is some of my code:
clear all
clf
lambda = 700*10^-7;
a=-7;
b=0.1;
c=7;
distances_one = [];
first_intensity_vector = [];
for x = a:b:c
l = 10;
x3 = 10^-3;
djx = sqrt((l^2)+(x-x3)^2);
distances_one = [distances_one,djx];
intensity_one = abs(exp((complex(0,1)*2*pi*djx)/lambda));
first_intensity_vector = [first_intensity_vector, intensity_one];
end
(same thing for two, three, four and five)
fiv = first_intensity_vector;
siv = second_intensity_vector;
tiv = third_intensity_vector;
fuiv= fourth_intensity_vector;
fiiv= fifth_intensity_vector;
figure
tot_intensity_vector = fiv + siv + tiv + fuiv + fiiv
plot(tot_intensity_vector,screen_x_values, "r-")
Here is an image of how it looks:
Simply a grey, empty space where my plot should be.
I would appreciate help greatly.
Thank you at beforehand.
  2 个评论
Davide
Davide 2025-6-11
Ran in:
same thing here. I also tried with the most simple of plots, like:
x = 0:pi/100:2*pi;
y = sin(x);
plot(x,y)
but nothing is showing
William
William 2025-9-11，12:29
编辑：William 2025-9-11，12:32
I had the same problem and it was solved when I restarted r2025 and waited patiently for it to intialize before running any scripts. Seems to have been cause by running scripts before R2025 was ready. Thank you!!

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KALYAN ACHARJYA
KALYAN ACHARJYA 2025-4-14
编辑：KALYAN ACHARJYA 2025-4-14
Ran in:
clear all
clf
lambda = 700*10^-7;
a = -7;
b = 0.1;
c = 7;
x_vals = a:b:c; % Store x values, Is that x values
distances_one = [];
first_intensity_vector = [];
for x = x_vals
l = 10;
x3 = 10^-3;
djx = sqrt((l^2)+(x-x3)^2);
distances_one = [distances_one,djx];
intensity_one = abs(exp((complex(0,1)*2*pi*djx)/lambda));
first_intensity_vector = [first_intensity_vector, intensity_one];
end
fiv = first_intensity_vector; % Change the data with real values
siv = first_intensity_vector; % Change the data with real values
tiv = first_intensity_vector; % Change the data with real values
fuiv = first_intensity_vector; % Change the data with real values
% Total intensity
tot_intensity_vector = fiv + siv + tiv + fuiv + fuiv;
figure;
plot(x_vals, tot_intensity_vector, 'r-');
xlabel('Screen Position (x)');
ylabel('Total Intensity');
grid on;
Is that, are you looking for?
  6 个评论
显示 4更早的评论
KALYAN ACHARJYA
KALYAN ACHARJYA 2025-4-15
The variables used in the code must be defined before they are referenced. The gray window appears due to the figure; function, but the rest of the code is not executable because the required variables () have not been defined.
siv = second_intensity_vector;
tiv = third_intensity_vector;
fuiv= fourth_intensity_vector;
fiiv= fifth_intensity_vector;
Ellinor
Ellinor 2025-4-15

Hello. Thank you so much for your answer. However, I defined those variables in my code, I simply didn't post all my code, I only posted the code for the fifth intensity vector.

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