Having trouble in running this code. What should I do next?

% Assuming 'saveToFile' is already defined

parts = 500;

% Read data from the CSV file
data = dlmread('2-2.csv', '\t', 1, 0);
%l = data(:, 1);
%alpha = data(:, 2);
%times = data(:, 3);
%ani = data(:, 4);
Var1 = data(:, 1);
Var2 = data(:, 2);
Var3 = data(:, 3);
Var4 = data(:, 4);
% Reshape ani and times into grids
aniGrid = reshape(ani, parts, parts)';
timeGrid = reshape(times, parts, parts)';

% Plot the aniGrid
figure('Position', [0, 0, 1000, 500]);

imagesc('XData', l, 'YData', alpha, 'CData', aniGrid);
colormap('turbo');
title('Ani');
xlabel('$l$', 'Interpreter', 'latex');
ylabel('$\alpha$', 'Interpreter', 'latex');

colorbar('Location', 'southoutside');
set(gca, 'Position', get(gca, 'Position') + [0, -0.05, 0, 0]);

if saveToFile
    saveas(gcf, 'ani.png', 'png');
else
    % Display the plot
    drawnow; % Ensure the plot is displayed before continuing
    pause(0.1); % Pause for a short time to allow the figure to be rendered
end
% Assuming 'timeGrid', 'l', 'alpha', and 'saveToFile' are already defined

figure('Position', [0, 0, 1000, 500]);

imagesc('XData', l, 'YData', alpha, 'CData', timeGrid);
colormap(turbo);
title('Time [s]');
xlabel('$t$', 'Interpreter', 'latex');
ylabel('$\alpha$', 'Interpreter', 'latex');

colorbar('Location', 'southoutside');
set(gca, 'Position', get(gca, 'Position') + [0, -0.05, 0, 0]);

if saveToFile
    saveas(gcf, 'time.png', 'png');
else
    % Display the plot
    drawnow; % Ensure the plot is displayed before continuing
    pause(0.1); % Pause for a short time to allow the figure to be rendered
end

[Dyuman Joshi]

What exactly is the trouble? We can't run your code because there are undefined parameters.

Additionally -

> Do not use the deprecated dlmread(), use readmatrix instead.

> Use a for loop instead of repeating the same code structure.

[Bhumi Desai]

The trouble is that only where I am lacking in making code. I want to define the parameters. I want the following code for this purpose.

[Dyuman Joshi]

"The trouble is that only where I am lacking in making code. "

I don't understand what you meant here.

"I want to define the parameters."

Which parameters?

"I want the following code for this purpose."

Which purpose?

[Bhumi Desai]

I want the code for making color graph for four variables using .csv file in MATLAB. Else which will be the suitable method for making the color graph, as I have 500 readings in .csv file. Please give me the answer.

Answer 1

[Benjamin Thompson]

Here are fixes for the first few lines so that dlmread works. But not sure what you are trying to do after that. Calling reshape with parameters of 500 and 500 means that the input vector must be 500*500=250000 in size.

% Assuming 'saveToFile' is already defined
parts = 500;
% Read data from the CSV file
data = dlmread('2-2.csv', ',', 0, 0);
%l = data(:, 1);
%alpha = data(:, 2);
%times = data(:, 3);
%ani = data(:, 4);
Var1 = data(:, 1);
Var2 = data(:, 2);
Var3 = data(:, 3);
Var4 = data(:, 4);

[Bhumi Desai]

I am not able to make a smooth graph using 115 values. I am sending the coding for this :

l = [501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615];
alpha = [0.000501, 0.000502, 0.000503, 0.000504, 0.000505, 0.000506, 0.000507, 0.000508, 0.000509, 0.000510, 0.000511, 0.000512, 0.000513, 0.000514, 0.000515, 0.000516, 0.000517, 0.000518, 0.000519, 0.000520, 0.000521, 0.000522, 0.000523, 0.000524, 0.000525, 0.000526, 0.000527, 0.000528, 0.000529, 0.000530, 0.000531, 0.000532, 0.000533, 0.000534, 0.000535, 0.000536, 0.000537, 0.000538, 0.000539, 0.000540, 0.000541, 0.000542, 0.000543, 0.000544, 0.000545, 0.000546, 0.000547, 0.000548, 0.000549, 0.000550, 0.000551, 0.000552, 0.000553, 0.000554, 0.000555, 0.000556, 0.000557, 0.000558, 0.000559, 0.000560, 0.000561, 0.000562, 0.000563, 0.000564, 0.000565, 0.000566, 0.000567, 0.000568, 0.000569, 0.000570, 0.000571, 0.000572, 0.000573, 0.000574, 0.000575, 0.000576, 0.000577, 0.000578, 0.000579, 0.000580, 0.000581, 0.000582, 0.000583, 0.000584, 0.000585, 0.000586, 0.000587, 0.000588, 0.000589, 0.000590, 0.000591, 0.000592, 0.000593, 0.000594, 0.000595, 0.000596, 0.000597, 0.000598, 0.000599, 0.000600, 0.000601, 0.000602, 0.000603, 0.000604, 0.000605, 0.000606, 0.000607, 0.000608, 0.000609, 0.000610, 0.000611, 0.000612, 0.000613, 0.000614, 0.000615];
timeGrid = [1.1965, 1.2156, 1.1496, 1.1169, 1.1986, 1.1619, 1.152, 1.2248, 1.1671, 1.2795, 1.2231, 1.12, 1.1513, 1.2714, 1.1471, 1.1902, 1.1618, 1.1437, 1.1235, 1.1084, 1.2409, 1.1498, 1.1848, 1.2428, 1.2781, 1.1219, 1.1681, 1.253, 1.1555, 1.2627, 1.2301, 1.1782, 1.2236, 1.0906, 1.1892, 1.2634, 1.214, 1.1825, 1.1592, 1.1044, 1.1749, 1.2709, 1.1691, 1.1636, 1.0794, 1.2197, 1.1494, 1.0929, 1.1496, 1.1302, 1.1965, 1.1212, 1.0977, 1.149, 1.1736, 1.1415, 1.1192, 1.1286, 1.1294, 1.2023, 1.0844, 1.1158, 1.1842, 1.1777, 1.1583, 1.149, 1.1621, 1.1585, 1.1116, 1.1295, 1.1031, 1.1787, 1.0839, 1.1488, 1.1158, 1.1675, 1.1396, 1.1329, 1.2167, 1.1155, 1.1571, 1.1542, 1.1266, 1.0997, 1.1041, 1.1283, 1.1238, 1.146, 1.1437, 1.1243, 1.1591, 1.12, 1.1345, 1.1399, 1.1647, 1.186, 1.2467, 1.1541, 1.1335, 1.1188, 1.1368, 1.1198, 1.103, 1.121, 1.1466, 1.1098, 1.0906, 1.0751, 1.1348, 1.0865, 1.0954, 1.1359, 1.1173, 1.0972  ];
figure('Position', [0, 0, 1000, 500]);

%imagesc('XData', l, 'YData', alpha, 'CData', timeGrid);
custom_colormap = jet(256);
normalized_timeGrid = (timeGrid - min(timeGrid)) / (max(timeGrid) - min(timeGrid));
figure('Position', [0, 0, 1000, 500]);

imagesc('XData', l, 'YData', alpha, 'CData', normalized_timeGrid);
colormap(custom_colormap);
title('Time [s]');
xlabel('$t$', 'Interpreter', 'latex');
ylabel('$\alpha$', 'Interpreter', 'latex');

colorbar('Location', 'southoutside');
set(gca, 'Position', get(gca, 'Position') + [0, -0.05, 0, 0]);

[Benjamin Thompson]

Your code seems to run and produce a color bar plot. What is wrong with it?

[Walter Roberson]

It isn't "smooth"

[Bhumi Desai]

This graph is not smooth in coloring, it forms like different color gathering together. I want a smooth color graph like some paintings.

[Walter Roberson]

You are displaying the output as if you had a grid that is l in one direction and alpha in the other direction. But you do not have such a grid: you have vectors l and alpha and timeGrid that are all the same length. l and alpha are each equally spaced.

The best you can do is something like

plot(l, timeGrid);