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

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gsourop
gsourop 2018-10-25
评论： Adam Danz 2018-10-25
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.

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采纳的回答

Dennis
Dennis 2018-10-25
编辑：Dennis 2018-10-25
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

更多回答（1 个）

Adam Danz
Adam Danz 2018-10-25
编辑：Adam Danz 2018-10-25
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 个评论
gsourop
gsourop 2018-10-25
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 2018-10-25
Oops, I forgot the first 3 lines of code. I updated my answer to include them.

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