How to use strcat in imwrite to save multiple figures

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Kelsey Ward
Kelsey Ward 2023-10-24
评论： Walter Roberson 2023-10-25
I am trying to save figures in a loop using strcat and imwrite but I get the following error:
Error using imwrite (line 442)
Expected DATA to be one of these types:
double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64,
logical
Instead its type was matlab.graphics.chart.primitive.Line.
This is a subset of the code I am using to make the figures:
nfile = 'filename.nc';
z = [];
T = [];
L = [];
for j = 5:60;
nfile = strcat('folder_location/40f17_',num2str(j,'%02d'),'_1.nc');
z = ncread(nfile, 'z');
T = ncread(nfile, 'T');
L = ncread(nfile, 'L');
MeansL = mean(L,'omitnan');
MeansT = mean(T,'omitnan');
MeansZ = mean(z,'omitnan');
n_L = length(MeansL);
n_T = length(MeansT);
n_z = length(MeansZ);
time_L = 1:n_L;
time_T = 1:n_T;
time_z = 1:n_z;
plotL = plot(time_L,MeansL);
imwrite(plotL,strcat('folder_location/L40f17_',num2str(j,'%02d'),'.png'));
plotT = plot(time_T,MeansT);
imwrite(plotT,strcat('folder_location/T40f17_',num2str(j,'%02d'),'.png'));
plotZ = plot(time_z,MeansZ);
imwrite(plotZ,strcat('folder_location/z40f17_',num2str(j,'%02d'),'.png'));
end
It's just simple line graphs that I am trying to save directly as png files.

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回答（1 个）

Walter Roberson
Walter Roberson 2023-10-24
See exportgraphics()
  5 个评论
显示 3更早的评论
DGM
DGM 2023-10-25
编辑：DGM 2023-10-25
You might be taking my earlier advice a little too severely. My point was to discourage using figure capture when your inputs are strictly raster images. When you're trying to capture graphics objects (line plots, charts, etc), it's appropriate to use exportgraphics(), saveas(), etc.
exportgraphics(gca,'myfilename.png') % just the axes
or
exportgraphics(gcf,'myfilename.png') % the figure
Walter Roberson
Walter Roberson 2023-10-25
nfile = 'filename.nc';
z = [];
T = [];
L = [];
ax = gca;
for j = 5:60;
nfile = strcat('folder_location/40f17_',num2str(j,'%02d'),'_1.nc');
z = ncread(nfile, 'z');
T = ncread(nfile, 'T');
L = ncread(nfile, 'L');
MeansL = mean(L,'omitnan');
MeansT = mean(T,'omitnan');
MeansZ = mean(z,'omitnan');
n_L = length(MeansL);
n_T = length(MeansT);
n_z = length(MeansZ);
time_L = 1:n_L;
time_T = 1:n_T;
time_z = 1:n_z;
plot(ax, time_L,MeansL);
exportgraphics(ax,strcat('folder_location/L40f17_',num2str(j,'%02d'),'.png'));
plot(ax, time_T,MeansT);
exportgraphics(ax, plotT,strcat('folder_location/T40f17_',num2str(j,'%02d'),'.png'));
plot(ax, time_z,MeansZ);
exportgraphics(ax, plotZ,strcat('folder_location/z40f17_',num2str(j,'%02d'),'.png'));
end

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