I keep getting an error message in my code

I keep getting error message. I started out the code with the 2 lines below:

13 addpath(strcat(pwd,'\functions\')) % add path where you saved to memd function

14 save_path = strcat(pwd,'\figs\'); % path where you want to save your figures

And I keep getting the message:

Warning: Name is nonexistent or not a directory: C:\Users\Name\Downloads\functions

> In path (line 109) (line 109 is a blank in the code)

>In addpath (line 86)

In MyVersiontestcode (line 13)

noise = 0×15000 empty double matrix

Error using plot

Invalid color or line style.

Error in MyVersiontestcode (line 86)

86 plot(t,data_na(i,:),'color',col(:,i),'LineWidth',2);

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Does somebody have a suggestion as to what the problem might be?

Thank you

Gabe

Answer 1

[Walter Roberson]

plot(t,data_na(i,:),'color',col(:,i),'LineWidth',2);

My guess is that you need

plot(t,data_na(i,:),'color',col(i,:),'LineWidth',2);

[Gabriel]

Thank you. Unfortunately, that did not fix the problems, and I keep getting the same error message.

[Walter Roberson]

Well, there are a few possibilities:

• t might be a character vector or string() object, and plot() is trying to interpret it as an option
• data_na(i,:) might be a character vector or a string() object, and plot() is trying to interpret it as a line specification.
• col(:,i) or col(i,:) might not be either numeric or a character vector or a string() object
• col(:,i) or col(i,:) might not be either scalar or of length 3 or length 4
• You might have a third-party plot.m in your MATLAB path that is interfering with calling the built-in plot() function

[Gabriel]

data_na(i,:) is a character vector. Assuming I want the plot() to interpret as such, how can this be occrected?

[Walter Roberson]

There is no way to plot using character vectors as coordinates.

One possibility is

plot(t,double(data_na(i,:)),'color',col(i,:),'LineWidth',2);
XT = xticks;
xlabel(cellstr(char(XT(:))))

This will treat the character entries in data_na as a vector of offsets, draw using those coordinates, and then relabel the tick positions back to the character versions. For example if data_na(i,:) were 'DEAD' then it would treat it as double(['D', 'E', 'A', 'D']) which is [68 69 65 68] and would draw using those as coordinates.

I have to wonder, however, whetherr data_na(i,:) represents categorical data? If so then something more like

plot(t, categorical(cellstr(data_na)))

would be expected, treating each row of data_na as a categorical entry.

Maybe what is going on should be converted to

pointsize = 16;
scatter(t, categorical(cellstr(data_na)), pointsize, col)

with no loop.

[Gabriel]

Thank you. I'll change the code and see =how it works.