Why do I receive empty outputs in cell arrays after an if statement?

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Hi everyone,
I am applying an if statement in doubles and allocate outputs in cell arrays, such as
stars{1}='*'; stars{2}='**'; stars{3}='***-';
crvalue{1} = 1.282; crvalue{2} = 1.645; crvalue{3} = 2.326;
for i = 1 : 8
C = randn(17,2);
for j = 1 :size(C,1)
if C(j,2) > crvalue{1}
results{j,i} = sprintf('%.2f%s', C(j,1), stars{1});
if C(j,2) > crvalue{2}
results{j,i} = sprintf('%.2f%s', C(j,1), stars{2});
if C(j,2) > crvalue{3}
results{j,i} = sprintf('%.2f%s', C(j,1), stars{3});
if C(j,2) < crvalue{1}
results{j,i} = C(j,2);
end
end
end
end
end
end
I am only doing one-sided hypothesis testing and want to find an easier way to get my results. However, the cell array 'results' delivers empty cells.

Accepted Answer

Dennis
Dennis on 25 Oct 2018
Edited: Dennis on 25 Oct 2018
You nested your if statements, hence the last statement
if C(j,2) < crvalue{1}
will only be executed if the previous statements are true.
stars{1}='*'; stars{2}='**'; stars{3}='***-';
crvalue{1} = 1.282; crvalue{2} = 1.645; crvalue{3} = 2.326;
for i = 1 : 8
C = randn(17,2);
for j = 1 :size(C,1)
if C(j,2) > crvalue{3}
results{j,i} = sprintf('%.2f%s', C(j,1), stars{3});
elseif C(j,2) > crvalue{2}
results{j,i} = sprintf('%.2f%s', C(j,1), stars{2});
elseif C(j,2) > crvalue{1}
results{j,i} = sprintf('%.2f%s', C(j,1), stars{1});
elseif C(j,2) < crvalue{1}
results{j,i} = C(j,2);
end
end
end

More Answers (1)

Adam Danz
Adam Danz on 25 Oct 2018
Edited: Adam Danz on 25 Oct 2018
This version is a lot cleaner and fixes some other issues in your code such as allocating the results cell array.
stars{1}='*'; stars{2}='**'; stars{3}='***-';
crvalue = [1.282, 1.645, 2.326];
results = cell(17, 8);
for i = 1 : 8
C = randn(17,2);
for j = 1 :size(C,1)
g = max(find( C(j,2) > crvalue, length(crvalue)));
if isempty(g)
results{j,i} = C(j,2);
else
results{j,i} = sprintf('%.2f%s', C(j,1), stars{g});
end
end
end
results =
17×8 cell array
{[-0.17809]} {[ 0.21487]} {[ 0.1679]} {'2.16*' } {[-0.22357]} {[ -1.2048]} {[-0.076898]} {[ 0.81204]}
{[ -1.2298]} {[ 0.79815]} {'0.81*' } {[ -0.78924]} {[ -1.8436]} {[ -1.2214]} {[ -0.79468]} {[-0.82839]}
{[ 0.23592]} {[ 0.66115]} {[ 0.13897]} {[ 0.28164]} {[ 1.2646]} {[ -0.93917]} {[ -0.86142]} {[-0.96019]}
{[ -1.5158]} {[ 0.80677]} {'-0.19**' } {[ 0.91823]} {[0.052461]} {[ 0.12853]} {[ 0.15585]} {[-0.44851]}
{[ 0.14905]} {[ -1.3359]} {'0.09*' } {[-0.072479]} {[ 0.39338]} {[ 0.22861]} {[ 0.24215]} {[ 0.79749]}
{'-0.05**' } {[ 0.1088]} {[ 0.51407]} {[ -0.4045]} {[-0.68554]} {[ 0.67834]} {[ -0.23146]} {[-0.23779]}
{[ -2.0189]} {[ -1.6722]} {[ 1.1261]} {[ -0.70628]} {[ -1.4358]} {[ -0.56188]} {[ -1.0168]} {[-0.26382]}
{[-0.49984]} {[ 0.67732]} {[-0.61416]} {[ -0.37119]} {[ 0.22429]} {[ 0.022608]} {[ -1.1964]} {[ -0.1657]}
{[ 1.086]} {[-0.12485]} {[-0.58216]} {[ 0.22281]} {[ 0.49732]} {[ -0.42034]} {[ -1.8448]} {[ 0.74226]}
{[ 0.91469]} {'-0.54**' } {[ -1.6322]} {[ 0.67979]} {[-0.51625]} {[ -1.0327]} {[ -0.02224]} {[ 0.43704]}
{[-0.31121]} {[ 0.58413]} {[-0.25497]} {[ -1.2525]} {[-0.59535]} {[ 1.0832]} {[ -0.7387]} {[-0.28457]}
{[ 1.2332]} {[ 0.16294]} {'-0.17**' } {[ 0.65908]} {[ 1.0631]} {[-0.013716]} {[ 0.39654]} {[ 0.4468]}
{[-0.75311]} {'-2.48*' } {[-0.59098]} {[ 1.0899]} {[ 0.22924]} {[ 0.8879]} {[ 1.2352]} {[ 1.1911]}
{[-0.35791]} {[ 0.57181]} {[ 0.11582]} {[0.0011519]} {[ 0.1029]} {[ 0.35997]} {[ -0.52432]} {[ 0.20621]}
{[-0.78979]} {[ 0.26162]} {[ 0.72697]} {[ -0.23341]} {[ 0.35146]} {[ -0.21522]} {[ -1.0894]} {[ 0.76702]}
{[ -1.5112]} {[ -1.7766]} {[-0.74442]} {[ 0.71567]} {'1.25***-'} {[ 0.41003]} {[ 0.58509]} {[ -0.8177]}
{[ -1.7082]} {[ 1.2142]} {[-0.45693]} {[ -0.1592]} {'0.55**' } {[ 0.088993]} {'2.14**' } {[ 0.7668]}
  2 Comments
gsourop
gsourop on 25 Oct 2018
Hi there,
Thank for your time to answer my question. When I run the code I get an error 'Undefined operator '>' for input arguments of type 'cell'
The code I run is
stars{1}='*'; stars{2}='**'; stars{3}='***-';
crvalue{1} = 1.282; crvalue{2} = 1.645; crvalue{3} = 2.326;
for i = 1 : 8
C = randn(17,2);
for j = 1 :size(C,1)
g = max(find( C(j,2) > crvalue, length(crvalue)));
if isempty(g)
results{j,i} = C(j,2);
else
results{j,i} = sprintf('%.2f%s', C(j,1), stars{g});
end
end
end
results
Adam Danz
Adam Danz on 25 Oct 2018
Oops, I forgot the first 3 lines of code. I updated my answer to include them.

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